...to underestimate one’s self is as much a departure from truth as to exaggerate one’s own powers.

To underestimate oneself is as much an exaggeration of one's powers than the other.

An intelligent woman herself, the Duchess had overestimated the Marshal’s intelligence. Not an ambitious woman, she had underestimated his ambition. So are many misread by other’s lights.

"People tend to overestimate my character," I say quietly. "They think that because I'm small, or a girl, or a Stiff, I can't possibly be cruel. But they're wrong."

As usual, He underestimated the human potential for self-deception.

People tend to underestimate him on first acquaintance. It’s a mistake they only make once. Whether or not they survive.

I am trying to shake this habit of underestimating my impact.

We all either underestimate each other, or else exaggerate each other’s virtues. Very few people are capable of assessing others as they deserve. It is a particular gift. In fact I would even say that only the great are capable of it.

I think that Man in creating God somewhat overestimated his abilities.

To overestimate the originality of one's thoughts is perhaps a less serious defect than being unaware of their newness. There is a more pronounced lack of sensitivity in underestimating (ourselves and others) than in overestimating.

People overvalue their knowledge and underestimate the probability of their being wrong.

"God does not give us more than we can handle," I am told but I wonder if God doesn't overestimate me just a little. Or perhaps, and this is likely, I underestimate God.

I thought I was wrong once, but I found out later that I was mistaken. (Seldom Seen Smith)

I am constantly overestimating and underestimating the human race - that rarely do I ever simply estimate it.