My Friend is that one whom I can associate with my choicest thought.

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.

Of course it is of no use to direct our steps to the woods, if they do not carry us thither. I am alarmed when it happens that I have walked a mile into the woods bodily, without getting there in spirit.... What business have I in the woods, if I am thinking of something out of the woods?

A familiar name cannot make a man less strange to me. It may be given to a savage who retains in secret his own wild title earnedin the woods. We have a wild savage in us, and a savage name is perchance somewhere recorded as ours.

All fables, indeed, have their morals; but the innocent enjoy the story.

Sincerity is a great but rare virtue, and we pardon to it much complaining, and the betrayal of many weaknesses.

I love you not as something private and personal, which is my own, but as something universal and worthy of love which I have found.