Metaphysics means nothing but an unusually obstinate effort to think clearly.

Every way of classifying a thing is but a way of handling it for some particular purpose.

The mind of your own enemy, the pupil, is working away from you, as keenly and eagerly as is the mind of the commander on the other side from the scientific general. Just what the respective enemies want and think, and what they know or do not know, are as hard things for the teachers as for the general to find out.

Real culture lives by sympathies and admirations, not by dislikes and disdains; under all misleading wrappings it pounces unerringly upon the human core.

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.

Pretend what we may, the whole man within us is at work when we form our philosophical opinions.

You can alter your life by altering the state of your mind.