An inner process stands in need of outward criteria.

That which cannot be said must not be said. That which cannot be said, one must be silent thereof.

He who lives in the present lives in eternity.

An honest religious thinker is like a tightrope walker. He almost looks as though he were walking on nothing but air. His support is the slenderest imaginable. And yet it really is possible to walk on it.

Language disguises thought.

Resting on your laurels is as dangerous as resting when you are walking in the snow. You doze off and die in your sleep.

A philosopher who is not taking part in discussions is like a boxer who never goes into the ring.