Most people say that it is the intellect which makes a great scientist. They are wrong: it is character.

All great and beautiful work has come of first gazing without shrinking into the darkness.

Small opportunities are often the beginning of great enterprises.

Enthusiasm is the mother of effort, and without it nothing great was ever achieved.

Unless you choose to do great things with it, it makes no difference how much you are rewarded, or how much power you have.

Death comes to all, but great achievements build a monument which shall endure until the sun grows cold.

After climbing a great hill, one only finds that there are many more hills to climb.

A great part of courage is the courage of having done the thing before.

Silence is one of the great arts of conversation.

Pray that your loneliness may spur you into finding something to live for, great enough to die for.