Education should turn out the pupil with something he knows well and something he can do well.

Education is the acquisition of the art of the utilisation of knowledge.

Algebra is the intellectual instrument which has been created for rendering clear the quantitative aspects of the world.

Speak out in acts; the time for words has passed, and only deeds will suffice.

In England if something goes wrong--say, if one finds a skunk in the garden--he writes to the family solicitor, who proceeds to take the proper measures; whereas in America, you telephone the fire department. Each satisfies a characteristic need; in the English, love of order and legalistic procedure; and here in America, what you like is something vivid, and red, and swift.

Great people plant trees they'll never sit under.

There is a technique, a knack, for thinking, just as there is for doing other things. You are not wholly at the mercy of your thoughts, any more than they are you. They are a machine you can learn to operate.