Strength does not come from physical capacity. It comes from an indomitable will.

Be strong! Don't talk of ghosts and devils.

If you are pure, if you are strong, you, one man are equal to the whole world.

The world is the great gymnasium where we come to make ourselves strong.

The cheerful mind perseveres and the strong mind hews its way through a thousand difficulties.

Why should a Man be Moral? Because this strengthens his will.