Generally speaking, in Scripture the word “fool” is used to describe someone in a morally deprived state. It does not, as in contemporary American usage, refer to a person’s lack of intellectual ability or to one whose actions convey those of a buffoon. Terms for “fool” appear all through Scripture, but wisdom literature contains the highest concentration. Proverbs uses over half a dozen words to describe the fool. All of them indicate some kind of moral breach and fall on a scale from the most morally hardened to the naive.

Obstinacy, recalcitrance, and closed-mindedness characterize the morally dense fool. Such individuals have no use for advice from others because they are “wise in their own eyes” (Prov. 3:7; cf. 12:15; 16:2). Fools frequently scoff at correction and rebuke (9:7 8, 12; 13:1; 14:6; 15:12; 19:25; 20:1; 21:11, 24; 22:10; 24:9). They manifest arrogance (21:24). Fools do not learn from their own mistakes or those of others but instead often repeat them (26:11). One of the main problems is that fools “lack sense,” which ultimately implies that they lack character (see 6:32; 7:7; 9:4, 16; 10:13, 21; 11:12; 12:11; 15:21; 17:18; 24:30). Such a person consistently makes poor decisions and loses the appetite and passion necessary for acquiring wisdom.

According to the book of Proverbs, three qualities make up the essential nature of the fool. First, the fool is unwilling to learn by means of discipline (3:11–12; 17:10), or formal instruction (17:16), or a word of advice (12:15), or personal experience (26:11). Second, the fool lacks self-control. Both the speech (15:2) and the behavior (14:16) of fools demonstrate a lack of restraint. They take the path of least resistance to easy money (1:8–19) and easy sex (7:6–27). Third, the fool is the one who rejects the fear of the Lord (1:7).

In the NT, the fool is the one who does not trust in God or in the power that God displays through the resurrection of Christ (Luke 24:25; Rom. 1:22; 1 Cor. 15:36). Jesus makes references to the fool when he tells the stories of the wise and foolish builders (Matt. 7:24–27) and the wise and foolish maidens (Matt. 25:1–13). Paul uses the term “foolish” to rebuke the Galatians for their refusal to accept the gospel (Gal. 3:1). However, in his correspondence with the church in Corinth, Paul reverses the conventional understanding of folly and uses it as a rhetorical strategy to communicate his message. He speaks of the message of the cross as foolishness to the world (1 Cor. 1:18). On another occasion, in order to argue against the arrogance of his opponents, Paul engages in “a little foolishness” (2 Cor. 11:1) as he boasts about his ministry, which is riddled with failure (2 Cor. 11–12).

Physiologically, the heart is an organ in the body, and in the Bible it is also used in a number of metaphors.

Metaphorically, the heart refers to the mind, the will, the seat of emotions, or even the whole person. It also refers to the center of something or its inner part. These metaphors come from the heart’s importance and location.

Mind. The heart refers to the mind, but not the brain, and in these cases does not involve human physiology. It is a metaphor, and while the neurophysiology of the heart may be interesting in its own right, it has no bearing on this use of language. Deuteronomy 6:5 issues the command to love God with all one’s heart, soul, and strength. When the command is repeated in the Gospels, it occurs in three variations (Matt. 22:37; Mark 12:30; Luke 10:27). Common to all three is the addition of the word “mind.” The Gospel writers want to be sure that the audience hears Jesus adding “mind,” but this addition is based on the fact that the meaning of the Hebrew word for “heart” includes the mind.

The mental activities of the metaphorical heart are abundant. The heart is where a person thinks (Gen. 6:5; Deut. 7:17; 1 Chron. 29:18; Rev. 18:7), where a person comprehends and has understanding (1 Kings 3:9; Job 17:4; Ps. 49:3; Prov. 14:13; Matt. 13:15). The heart makes plans and has intentions (Gen. 6:5; 8:21; Prov. 20:5; 1 Chron. 29:18; Jer. 23:20). One believes with the heart (Luke 24:25; Acts 8:37; Rom. 10:9). The heart is the site of wisdom, discernment, and skill (Exod. 35:34; 36:2; 1 Kings 3:9; 10:24). The heart is the place of memory (Deut. 4:9; Ps. 119:11). The heart plays the role of conscience (2 Sam. 24:10; 1 John 3:20 21).

It is often worth the effort to substitute “mind” for “heart” when reading the Bible in order to grasp the mental dimension. For example, after telling the Israelites to love God with all their heart, Moses says, “These commandments that I give you today are to be upon your hearts” (Deut. 6:6). Reading it instead as “be on your mind” changes our perspective, and in this case the idiom “on your mind” is clearer and more accurate. The following verses instruct parents to talk to their children throughout the day about God’s words. In order for parents to do this, God’s requirements and deeds need to be constantly on their minds, out of their love for him. Similarly, love for God and loyalty are expressed by meditation on and determination to obey his law (Ps. 119:11, 112). The law is not merely a list of rules; it is also a repository of a worldview in which the Lord is the only God. To live consistently with this truth requires careful, reflective thought.

Emotions and attitude. The heart, as the seat of emotion, is associated with a number of feelings and sentiments, such as gladness (Exod. 4:14; Acts 2:26), hatred (Lev. 19:17), pride (Deut. 8:14), resentment (Deut. 15:10), dread (Deut. 28:67), sympathy (Judg. 5:9), love (Judg. 16:15), sadness (1 Sam. 1:8; John 16:6), and jealousy and ambition (James 3:14). The heart is also the frame of reference for attitudes such as willingness, courage, and desire.

A kingdom signifies the reality and extent of a king’s dominion or rule (Gen. 10:10; 20:9; Num. 32:33; 2 Kings 20:13; Esther 1:22). Some kingdoms were relatively small; others were concerted attempts to gain the whole world.

A kingdom presupposes monarchy, rule by an individual, human authority. Although kings only have as much authority as their armies and the general populace allow, they nevertheless exercise an almost absolute power, which invites either profound humility or hubris. Royal arrogance, unfortunately, is the primary motif characterizing kings in the Bible (e.g., Dan. 3).

God originally intended Israel to be governed as a theocracy, ruled by the one, true, living God (but see Gen. 17:6; Deut. 17:14 20). Israel was to be a “kingdom of priests” (Exod. 19:6), but the people demanded a king (1 Sam. 8:1–22). However, even when God granted their request, God remained King over the king and even retained ownership of the land (Lev. 25:23, 42, 55). The Israelite king was nothing more than God’s viceroy, with delegated authority. With few exceptions, most of the kings of Israel and Judah were corrupted by authority and wealth and forgot God (1 Sam. 13:13–14; 15:28; Matt. 14:6–11). But God made a covenant with David, so that one of his descendants would become a coregent in a restored theocracy, the kingdom of God (2 Sam. 7:1–29; Pss. 89:3; 132:11). In contrast to David’s more immediate descendants, this coming king would return to Jerusalem humble and mounted on a donkey (Zech. 9:9; cf. Isa. 62:11). The Gospels present Jesus Christ as this king (Matt. 21:1–9 pars.). Those who are likewise humble will inherit the land with him (Matt. 5:5).

God begins his creation with light, which precedes the creation of sun, moon, and stars and throughout Scripture is an unqualified good (Gen. 1:3 5, 15–18; Exod. 10:23; 13:21). In the ancient world, people rarely traveled at night and usually went to bed soon after sunset. The only light in the home was a small oil lamp set on a stand, which burned expensive olive oil. Light is a biblical synonym for life (Job 3:20; John 8:12). Seeing the light means living (Ps. 49:19; see also Job 33:30). Conversely, darkness is often a symbol of adversity, disaster, and death (Job 30:26; Isa. 8:22; Jer. 23:12; Lam. 3:2).

John, who offers perhaps the most profound meditations on light, claims that God is light (1 John 1:5). The predicate appropriates the intrinsic beauty of light, a quality that draws people’s hearts back to the author of beauty. For the apostle, light represents truth and signifies God’s will in opposition to the deception of the world (John 1:9; 12:46). Light stands for purity and signifies God’s holiness as opposed to the unrighteousness of the world (John 3:19–21). Light is where God is, and it radiates from the place of fellowship between God and his creation (John 1:7).

In the OT, wisdom is a characteristic of someone who attains a high degree of knowledge, technical skill, and experience in a particular domain. It refers to the ability that certain individuals have to use good judgment in running the affairs of state (Joseph in Gen. 41:33; David in 2 Sam. 14:20; Solomon in 1 Kings 3:9, 12, 28). It can also refer to the navigational skills that sailors use in maneuvering a ship through difficult waters (Ps. 107:27). Furthermore, wisdom includes the particular skills of an artisan (Exod. 31:6; 35:35; 1 Chron. 22:15 16). In all these cases, wisdom involves the expertise that a person acquires to accomplish a particular task. In these instances “wisdom” is an ethically neutral term, or at least that dimension is not emphasized. The wise are those who have mastered a certain skill set in their field of expertise.

The uniqueness of the OT wisdom literature (Job, Proverbs, Ecclesiastes, etc.) is that it highlights the moral dimension of wisdom. Here “wisdom” refers to developing expertise in negotiating the complexities of life and managing those complexities in a morally responsible way that honors God and benefits both the community and the individual. Although it is difficult to pin down a concise definition, one can gain a better understanding of wisdom by investigating two important dimensions: wisdom as a worldview, and the traits of a person who is considered to be wise.

Who is wise? First, the wise are those involved in a lifelong process of character development. They manifest the virtues of righteousness, justice, and equity (Prov. 1:3; 2:9). The embodiment of these virtues culminates in the description of the woman of noble character at the conclusion of Proverbs (31:10–31). She exhibits self-control, patience, care, diligence, discipline, humility, generosity, honesty, and fear of the Lord (cf. James 3:13–18). She is the epitome of wisdom in its maturity and the model that all should emulate.

Second, the wise know the value of words and how to use them. They know when to speak, what to say, and how to say it (Job 29:21–22; Prov. 15:23; 25:11; Eccles. 3:7; 12:9–10). Wisdom and the wise place a premium on the power of words.

Third, the wise place great importance on relationships and on interaction with others. The wise person is the one who is open to the give-and-take of relationships (Prov. 27:5–6, 17, 19). Such a person develops the humility necessary to receive correction and criticism from others. Hearing criticism and changing wrong behavior are integral to wisdom (3:1–11). The wise appreciate insightful criticism because it helps them live life more productively (15:12). Wisdom is, ultimately, relational.

Fourth, the wise person develops the art of discernment (Prov. 1:2, 4–6). The sage is equipped with the ability to think critically. The very quality of wisdom itself invites the re-forming and rethinking of ideas. Sages are not interested in pat answers (26:4–5). Proverbs 16:1–9 throws a wrench in the conventional cogs of wisdom, claiming that although humans make their plans, God has the final say. Both Job and Ecclesiastes go head to head with conventional beliefs, probing more deeply into the complexities of life and the relationship between human and divine. No easy answers exist here. In contrast, fools do not use their mental faculties. They view wisdom as a commodity, a matter of learning some techniques, accepting certain beliefs, and memorizing a few proverbs (17:16). The wise, however, know that wisdom involves the art of critical thinking and interacting with others.

Fifth, and most fundamental, the wise person takes a God-centered focus toward life. Wisdom literature affirms, “The fear of the Lord is the beginning of wisdom” (Prov. 9:10; cf. Prov. 1:7; Job 28:28; Eccles. 12:13). That this is the beginning step in the process of gaining wisdom means that one who misses this step can proceed no further along the path to wisdom. The fear of the Lord is to wisdom as the letters of the alphabet are to forming words. The wise gain wisdom by being in relationship with the Lord (Prov. 3:5–8). The fear of the Lord is the beginning as well as the culmination of wisdom.

Wisdom is a highly prized quality, superior to might and power (Prov. 25:15; Eccles. 9:13–16), and one must diligently seek it (Prov. 2:1–5). Yet in the end, wisdom is a gift that only God can give (Prov. 2:6–8; 1 Kings 3:9).