An inventor is a man who asks 'Why?' of the universe and lets nothing stand between the answer and his mind.

Self-esteem is reliance on one's power to think. It cannot be replaced by one's power to deceive. The self-confidence of a scientist and the self-confidence of a con man are not interchangeable states, and do not come from the same psychological universe. The success of a man who deals with reality augments his self-confidence. The success of a con man augments his panic.

The truly and deliberately evil men are a very small minority; it is the appeaser who unleashes them on mankind; it is the appeaser's intellectual abdication that invites them to take over. When a culture's dominant trend is geared to irrationality, the thugs win over the appeasers. When intellectual leaders fail to foster the best in the mixed, unformed, vacillating character of people at large, the thugs are sure to bring out the worst. When the ablest men turn into cowards, the average men turn into brutes.

He despised causeless affection, just as he despised unearned wealth. They professed to love him for some unknown reason and they ignored all the things for which he could wish to be loved.

I want to know that I've accomplished something. I want to feel that it had some meaning. At the last summing up, I want to be sure it wasn't all-for nothing.

Since religion is a primitive form of philosophy — an attempt to offer a comprehensive view of reality — many of its myths are distorted, dramatized allegories based on some element of truth, some actual, if profoundly elusive, aspect of man's existence.

Through all the years that I spent formulating my philosophical system, I was looking desperately for “intelligent agreement” or at least for “intelligent disagreement.” I found neither. Today, I am not looking for “intelligent disagreement” any longer ... What I am looking for is intelligent agreement.