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

Marvelous as may be the power of my dog to understand my moods, deathless as his affection and fidelity, his mental state is as unsolved a mystery to me as it was to my remotest ancestor.

... 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.

Intelligence is a fixed goal with variable means of achieving it.

Our colleges ought to have lit up in us a lasting relish for a better kind of man, a loss of appetite for mediocrities.

Anything you may hold firmly in your imagination can be yours.

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