A person's assumption that they are not infallible is not based on systematic calculation of his own mistakes; rather, it is based on certain facts that he has observed, which leads him to make certain predictions.

Firstly, a person realizes in his perception of other individuals, that all people make mistakes, and therefore assumes that the same applies for himself. This proof manifests itself in all as aspects of life. A student in Calculus class furiously raises his hand, eager to provide what he believes to undoubtedly be the correct answer, when he is proven to be wrong. A businesswoman finds herself on the wrong subway train, although she was certain she was going in the right direction. The discovery that the earth was round, disproved people who had vehemently believed that it was flat. Everyday, one can observe many mistakes, whether minor or...