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.

We travel to learn; and I have never been in any country where they did not do something better than we do it, think some thoughts better than we think, catch some inspiration from heights above our own.

Besides learning to see, there is another art to be learned - not to see what is not.

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.

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

I saw, in looking over Cooper, elements of a comet of 1825 which resemble what I get out for this, from my own observations, but I cannot rely upon my own.