I am just learning to notice the different colors of the stars, and already begin to have a new enjoyment.

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

The love of one's own sex is precious, for it is neither provoked by vanity nor retained by flattery; it is genuine and sincere.

I had only ordinary capacity but extraordinary persistency.

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.

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.

I would as soon put a girl alone into a closet to meditate as give her only the society of her needle.