The greatest enemy of any one of our truths may be the rest of our truths.

Faith is synonymous with working hypothesis.

It does not follow, because our ancestors made so many errors of fact and mixed them with their religion, that we should therefore leave off being religious at all. By being religious we establish ourselves in possession of ultimate reality at the only points at which reality is given us to guard. Our responsible concern is with our private destiny, after all.

The great use of life is to spend it for something that will outlast it." "This life is worth living, we can say, since it is what we make it." "Believe that life is worth living and your belief will help create the fact.

We must make automatic and habitual, as early as possible, as many useful actions as we can, and as carefully guard against the growing into ways that are likely to be disadvantageous.

Modern man . . . has not ceased to be credulous . . . the need to believe haunts him.

First... a new theory is attacked as absurd; then it is admitted to be true, but obvious and insignificant; finally it is seen to be so important that its adversaries claim that they themselves discovered it.