The greatest test of courage on earth is to bear defeat without losing heart.

The greatest test of courage on earth is to bear defeat without losing heart.

We need men with moral courage to speak and write their real thoughts, and to stand by their convictions, even to the very death.

It is a blessed thing that in every age someone has had the individuality enough and courage enough to stand by his own convictions

Courage without conscience is a wild beast.

The glory of science is, that it is freeing the soul -- breaking the mental manacles -- getting the brain out of bondage -- giving courage to thought -- filling the world with mercy, justice, and joy.