Intelligence has got the upper hand to such an extent that it transforms the real task into an unreal trick and reality into a play.

Anxiety is the dizziness of freedom.

Whoever has learned to be anxious in the right way has learned the ultimate.

Death is not earnest in the same way the eternal is. To the earnestness of death belongs precisely that remarkable capacity for awakening, that resonance of a profound mockery which, detached from the thought of the eternal, is an empty and often brash jest, but together with the thought of the eternal is just what it should be, utterly different from the insipid solemness which least of all captures and holds a thought with tension like that of death.

It is easy to see, though it scarcely needs to be pointed out, since it is involved in the fact that Reason is set aside, that faith is not a form of knowledge; for all knowledge is either a knowledge of the eternal, excluding the temporal and historical as indifferent, or it is pure historical knowledge. No knowledge can have for its object the absurdity that the eternal is the historical.

During the first period of our lives the greatest danger is not to take the risk. When once the risk has been taken, then the greatest danger is to risk too much. By not risking at first one turns aside and serves trivialities; in the second case, by risking too much, one turns aside to the fantastic and perhaps to presumption.

Take away paradox from the thinker and you have a professor.