To read a book, to think it over, and to write out notes is a useful exercise; a book which will not repay some hard thought is not worth publishing.

Let us secure not such books as people want, but books just above their wants, and they will reach up to take what is put out for them.

The greatest object in educating is to give a right habit of study.

How strange that some people cannot believe in both the Book of Nature and the Book of God.

The world of learning is so broad, and the human soul is so limited in power!

I am always the better for open-air breathing, and was certainly meant for the wandering life of the Indian.

Do not look at stars as bright spots only. Try to take in the vastness of the universe.