If any organism fails to fulfill its potentialities, it becomes sick.

We are spinning our own fates, good or evil, and never to be undone. Every smallest stroke of virtue or of vice leaves its never so little scar. ...Nothing we ever do is, in strict scientific literalness, wiped out.

An act has no ethical quality whatever unless it be chosen out of several all equally possible.

True is the name for whatever idea starts the verification process, useful is the name for its completed function in experience

It is only by risking our persons from one hour to another that we live at all. And often enough our faith beforehand in an uncertified result is the only thing that makes the result come true.

The faculty of voluntarily bringing back a wandering attention, over and over again, is the very root of judgment, character, and will... An education which should improve this faculty would be the education par excellence.

You do not sing because you're happy, you're happy because you sing.