Good-humor is a philosophic state of mind; it seems to say to Nature that we take her no more seriously than she takes us. I maintain that one should always talk of philosophy with a smile.

The question of free will is insoluble on strictly psychological grounds.

Few people have definitely articulated philosophies of their own. But almost everyone has his own peculiar sense of a certain total character in the universe, and of the inadequacy of fully to match it [to] the peculiar systems that he knows.

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

Habit is a second nature, or rather, it is 'ten times nature'.

In the matter of belief, we are all extreme conservatives.

You perceive now, my friends, what your general or abstract duty is as teachers. Although you have to generate in your pupils a large stock of ideas, any one of which may be inhibitory, yet you must also see to it that no habitual hesitancy or paralysis of the will ensues, and that the pupil still retains his power of vigorous action.