If I make up the definition of a mammal, and then, after inspecting a camel, declare "look, a mammal' I have indeed brought a truth to light in this way, but it is a truth of limited value.

The question whether truth is necessary, must not merely be affirmed beforehand, but must be affirmed to such an extent that the principle, belief, or conviction finds expression, that there is nothing more necessary than truth, and in comparison with it everything else has only a secondary value.

Truth alone will endure, all the rest will be swept away before the tide of time.

The truth is ugly: we have art so as not to perish from the truth.

Convictions are more dangerous foes of truth than lies.

On the mountains of truth you can never climb in vain: either you will reach a point higher up today, or you will be training your powers so that you will be able to climb higher tomorrow.