The definition of definition is at bottom just what the maxim of pragmatism expresses. - Charles Sanders Peirce

To know what we think, to be masters of our own meaning, will make a solid foundation for great and weighty thought.

Let it be considered that what is more wholesome than any particular belief is integrity of belief; and that to avoid looking into the support of any belief from a fear that it may turn out rotten is quite as immoral as it is disadvantageous.

It is terrible to see how a single unclear idea, a single formula without meaning, lurking in a young man’s head, will sometimes act like an obstruction … in an artery, hindering the nutrition of the brain, and condemning its victim to pine away in the fullness of his intellectual vigor and in the midst of intellectual plenty.