I do not believe there is any one study that can be taken up that will broaden the imagination, that will be the source from which will spring more deep thinking and sincere research than the study of astronomy.

We never know the timber of a man's soul until something cuts into him deeply and brings the grain out strong. You've the making of a mighty fine piece of furniture.

Nature always levies her tribute.

the friend in need is the one who is the friend in deed; ... if people were not friends in need, there was every likelihood that they never would be friends again in any conditions that might obtain.

When any man accumulates more than he can earn with his own hands, he begins to enrich himself at the expense of the youth, the sweat, the blood, the joy of his fellow men.

it takes the very wisest person there is to know when to talk, and when to keep still.

What you are lies with you. If you are lazy, and accept your lot, you may live in it. If you are willing to work, you can write your name anywhere you choose, among the only ones who live beyond the grave in this world, the people who write books that help, make exquisite music, carve statues, paint pictures, and work for others. Never mind the calico dress, and the coarse shoes. Work at you books, and before long you will hear yesterday's tormentors boasting that they were once classmates of yours.