The intellectual life of man consists almost wholly in his substitution of conceptual order for the perceptual order in which his experience originally comes.

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

Wisdom is learning what to overlook.

Those thoughts are truth which guide us to beneficial interaction with sensible particulars as they occur, whether they copy these in advance or not.

I am no lover of disorder and doubt as such. Rather do I fear to lose truth by this pretension to possess it already wholly.

The great use of life is to spend it for something that will outlast it.

Our volitional habits depend, then, first, on what the stock of ideas is which we have; and, second, on the habitual coupling of the several ideas with action or inaction respectively.