John 13:31-38 · Jesus Predicts Peter’s Denial
Known By Our Love
John 13:31-35
Sermon
by R. Robert Cueni
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Jesus and the apostles were celebrating that last supper together. Because Jesus was aware Judas was going to betray him, the Lord confronted him. It is an especially uncomfortable conversation that Jesus concluded by telling Judas, “Do quickly what you must do” (13:27).

After the apostle of betrayal slithered out of the room, Jesus turned his attention to those who remained. After a few preliminary remarks, Jesus delivered one of his more familiar teachings. “I give you a new commandment, that you love one another. Just as I have loved you, you also should love one another. By this everyone will know that you are my disciples, if you will have love for one another” (vv. 34-35).

It is often pointed out that the command to love one another, in and of itself, was not a new teaching. It had been a part of Jewish tradition for centuries. In explanatory comments on the Ten Commandments, Deuteronomy 6:5 says, “You shall love the Lord your God with all your heart, and with all your soul and with all your might.” Leviticus 19:18 adds that “you should love your neighbor as yourself.” The call to love one another was not new to Jewish teaching and it was also present in the wider Greco-Roman world.

We cannot make a case that loving one another was a new idea; at least not in the sense that it was the first time anyone heard about it. On the other hand, it seems plausible to say the newness of which Jesus spoke was that by our love for one another we will be identified as followers of Christ to the wider world. As the church camp song puts it, “They will know we are Christians by our love.”

The early church took this new command of Jesus quite seriously and quickly gained the reputation for caring for the needs of one another. Outsiders noticed that particularly in times of plagues and pestilence, Christians did not abandon their sick as was commonplace in that era.1 Caring for the sick and dying had translated into religious obligation. Outsiders noticed that by loving one another, people’s lives were transformed; that those who were loved reciprocated that love; that those identified as followers of Christ committed themselves to building a better world. For instance, Christian faith communities began to found hospitals, orphanages, and schools. As Tertullian, an early church leader reported, the Romans noticed how Christian behavior was out of the ordinary and they frequently exclaimed, “See how they love one another.”

It is good to be reminded of this truth. It is easy to forget that we will be known as followers of Christ by our love and not for some other behavior. Of course, every person who has claimed Christ through the ages has not necessarily lived up to the standard of “see how they love one another.”

General Leonidas Polk was a corps commander in the Confederate Army of Tennessee. He had the additional duty of being the Episcopal Bishop of Louisiana. Polk was considered a pious, righteous, and sometimes even a self-righteous Christian. Prior to the Battle of Perryville, Kentucky, one of Polk’s subordinates, General Benjamin Cheatham encouraged the troops by shouting, “Give ’em hell, boys.” A legend persists that the Very Reverend Bishop General Leonidas Polk seconded those encouraging words by saying, “Give it to ’em boys; give ’em what General Cheatham says.”2

There were 7,621 casualties at Perryville. Thousands of the children of God in both Union and Confederate armies lost their lives in that conflict. There is, of course, something positive to say about Christian military commander refraining from coarse language. However, Jesus instructed us to be known for our love. To my knowledge, he did not encourage us to kill our enemies while refusing to cuss.

In that same way, Jesus did not say that the faithful will be known by the fact we have read the Bible from cover to cover or that we believe everything in the Bible from Genesis right on through the maps. Jesus did not say that they will know us by our ability to recite the Apostles’ Creed both forward and backward. Our Lord did not say they will know us by the way we go to church regularly, because we have the outline of a fish on the bumper of our car, or because we claim to believe all the approved doctrines of twenty-first-century cultural Christianity. Jesus said his followers were to be identified by their love for one another.

Yet exactly what does this love for one another look like? How do we know it when we see it? How do we know it when we experience it? How do we know it when we do it?

Let me suggest that the psychologist Harry Stack Sullivan’s definition of the state of love provides a nice opening wedge into these questions. To paraphrase ever so slightly, Stack says that whenever you are as concerned about the safety, the satisfaction, or the happiness of another person as you are about your own safety, satisfaction, and happiness, there the state of love exists.

Love is much more than a feeling. It is even more than just about us. The focus of love is to be in our commitment to act in ways that promote the welfare, security, and happiness of others as much as we promote our own welfare, security, and happiness. When this standard of our love is being reciprocated, then we love one another. That understanding dwells at the heart of Jesus’ teaching on the expectation that a faithful person will “love our neighbors as ourselves.”

The Christian manual of specifics on how to do this is scattered throughout the New Testament. Let me point out a few examples:

  • 1 Corinthians 13:4-7 offers some behavioral specifics: “Love is patient; love is kind; love is not envious or boastful or arrogant or rude. It does not insist on its own way; it is not irritable or resentful; it does not rejoice in wrongdoing, but rejoices in the truth. It bears all things, believes all things, hopes all things, endures all things.”
  • Philippians 2:3 points to overall attitude and motivation. “Do nothing from selfish ambition or conceit, but in humility regard others as better than yourselves.”
  • Romans 12:9-10: “Let love be genuine; hate what is evil, hold fast to what it good; love one another with mutual affection; outdo one another in showing honor.”
  • 1 Peter 4:8: “Above all, maintain constant love for one another, for love covers a multitude of sins.”
  • Galatians 6:10: “So then, whenever we have an opportunity, let us work for the good of all, and especially for those of the family of faith.”

Notice that the call to love another is more than loving our friends and our close relatives. The call to faithfulness even requires loving more than our brothers and sisters in Christ. In Luke’s gospel, Jesus was quizzed about what one must do to inherit eternal life. He cited the command to love your neighbor as yourself. The questioner followed up with “And who is my neighbor?” In response, Jesus told a parable about how an outsider, a Samaritan acted in loving ways toward the beaten man and thus qualified as a loving neighbor. By the standards of today’s lectionary gospel reading, the Samaritan outsider would also be identified as a follower of Jesus Christ because he acted lovingly toward the beaten man at the side of the road. In Matthew, Jesus pushed the circle even wider when he said, “You have heard that it was said, ‘You shall love your neighbor and hate your enemy.’ But I say to you, love your enemies and pray for those who persecute you” (Matthew 5:43-44). In that passage I just mentioned from Galatians 6, Paul pushed the limits of loving one another to the absolute maximum when he called us to “work for the good of all.”

The reason for this is that as human beings, we are inextricably connected to one another. By that I mean we are all children of the same parent God and that puts us all in one family. This oneness we share as children of God forms a worldwide web of connectivity.

In the year 1624, English clergyman, poet, essayist, and lawyer John Donne was pondering this reality. Specifically, Donne was meditating on the question of why an outsider might be concerned about the death of a stranger. His insight is simple, clear, and as relevant today as it was nearly four centuries ago.3 We mourn because,

No one is an island,
Entire of itself,
Each of us is a piece of the continent,
A part of the main.
If a clod be washed away by the sea,
Europe is the less.
As well as if a promontory were.
As well as if the home of your friend
Or even your own home was washed away.
Each person’s death diminishes me,
For I am involved in humankind,
Therefore, do not send a neighbor to find out
For whom the death bell rings.
It rings for you.

We are all kinfolk. Because we are all part of this family of God, we are called to love one another. That means we are called to strive to be as concerned for the safety, satisfaction, and happiness of others as we are concerned for our own safety, satisfaction, and happiness.

Justin Martyr, a second-century theologian and interpreter of the faith, once remarked on how loving one another made a profound difference in the Christian community: “We who used to value the acquisition of wealth and possessions more than anything else now bring what we have into a common fund and share it with anyone who needs it. We used to hate and destroy one another and refused to associate with people of another race or culture. Now, because of Christ, we live together with such people and pray for our enemies.”

A love that is as concerned for others as it is concerned for self is the most powerful force in the world. As an unknown poet puts it:

Love changes everything it touches:
It makes heavy burdens light,
Long hours short.
Ordinary faces beautiful,
Houses into homes,
Picnics into banquets,
Wilted daisies into bouquets,
God into sacrifice and sinners into saints.
The poet ends with a challenging query.
Doesn’t it make you wonder what might happen to you
If you yielded to God’s love?
(source unknown)

Love has the potential to change everything. Experiencing love in your life can change you. Loving another person can change that person. Even you loving another person can change you. In fact, even loving your enemy just might transform that enemy to a friend.

In Christ, we are not only called to love one another, we are to be identified as followers of Jesus Christ by our love.

Thanks be to God for the blessing that comes with loving one another. Amen and amen.


1. William McNeill, Plagues and People (Garden City, New York: Anchor Books, 1976), p. 108.

2. James McDonough, James Lee, Chattanooga — A Death Grip on the Confederacy (Knoxville: University of Tennessee Press, 1984), pp. 243-245.

3. John Donne, “No man is an island, from Meditations for Emergent Occasions, 1624” (with a slight paraphrase to update the language), in public domain.

CSS Publishing Co., Inc., Can I get some help over here? : Cycle C sermons for Lent/Easter based on the gospel texts, by R. Robert Cueni