A kitten is so flexible that she is almost double; the hind parts are equivalent to another kitten with which the fore part plays. She does not discover that her tail belongs to her till you tread upon it.

There must be some nerve and heroism in our love, as of a winter morning.

A man who has to go to the village to get the news hasn't heard from himself in a long time.

He is not a true man of science who does not bring some sympathy to his studies, and expect to learn something by behavior as well as by application. It is childish to rest in the discovery of mere coincidences, or of partial and extraneous laws. The study of geometry is a petty and idle exercise of the mind, if it is applied to no larger system than the starry one. Mathematics should be mixed not only with physics but with ethics; that is mixed mathematics. The fact which interests us most is the life of the naturalist. The purest science is still biographical.

If one advances confidently in the direction of his dreams, and endeavors to live the life which he has imagined, he will meet with a success unexpected in common hours.

A man can suffocate on courtesy.

It is not enough that we are truthful; we must cherish and carry out high purposes to be truthful about.