Some time ago I came across this short story called, "Whom Should You Ask?"

An Amish man was once asked by an enthusiastic young evangelist whether he had been saved, and whether he had accepted Jesus Christ as his Lord and Savior?

The gentleman replied, "Why do you ask me such a thing? I could tell you anything. Here are the names of my banker, my grocer, and my farm hands. Ask them if I've been saved."

There is a sense that one cannot testify to one's self. When Mohammed Ali testified, "I am the greatest," that meant nothing until his works testified to that fact. In a sense, someone claiming, "I am a Christian" is invalid until there is someone or something else that confirms that testimony.