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

There is something of the same pleasure in noticing the hues of the stars that there is in looking at a flower garden in autumn.

Every formula which expresses a law of nature is a hymn of praise to God.

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

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.

We have a hunger of the mind which asks for knowledge of all around us, and the more we gain, the more is our desire; the more we see, the more we are capable of seeing.