To kill time is not murder, it's suicide.

... A rule of thinking which would absolutely prevent me from acknowledging certain kinds of truth if those ... truths were really there, would be an irrational rule.

We have to live today by what truth we can get today and be ready tomorrow to call it falsehood.

But it is the bane of psychology to suppose that where results are similar, processes must be the same. Psychologists are too apt to reason as geometers would, if the latter were to say that the diameter of a circle is the same thing as its semi-circumference, because, forsooth, they terminate in the same two points.

No more fiendish punishment could be devised, were such a thing physically possible, than that one should be turned loose in society and remain absolutely unnoticed.

Our esteem for facts has not neutralized in us all religiousness. It is itself almost religious. Our scientific temper is devout.

There can be no final truth in ethics any more than in physics, until the last man has had his experience and said his say.