Carve every word before you let it fall.

To be master of any branch of knowledge, you must master those which lie next to it, and thus to know anything you must know all.

Be willing to commit yourself to a course, perhaps a long and hard one, without being able to foresee exactly where you will come out.

The root of joy, as of duty, is to put all one's powers towards some great end.

A mind that is stretched by a new experience can never go back to its old dimensions.

A great man represents a great ganglion in the nerves of society, or to vary the figure, a strategic point in the campaign of history, and part of his greatness consists in his being there.

I despise making the most of one's time. Half of the pleasures of life consist of the opportunities one has neglected.