“To underestimate oneself is as much an exaggeration of one's powers than the other.”
“One could say, with a little exaggeration, that the persona is that which in reality one is not, but which oneself as well as others think one is.”
“My dear Watson," said [Sherlock Holmes], "I cannot agree with those who rank modesty among the virtues. To the logician all things should be seen exactly as they are, and to underestimate one's self is as much a departure from truth as to exaggerate one's own powers.”
“One must never allow oneself to acquire an exaggerated sense of one's own importance. There's no necessity to burden oneself with absolutes”
“It's much more difficult to judge oneself than to judge others.”
“One should never underestimate the power of books.”