Selfishness is one of the principal fruits of the corruption of human nature; and it is obvious that selfishness disposes us to over-rate our good qualities, and to overlook or extenuate our defects.
William 'Big Bill' Rockefeller, who sold cancer 'cures' from a medicine wagon, taught him to leap into his arms from a tall chair. One time his father held his arms out to catch him but pulled them away as little John jumped. The fallen son was told sternly, 'Remember, never trust anyone completely, not even me. '