The most difficult subjects can be explained to the most slow- witted man if he has not formed any idea of them already; but the simplest thing cannot be made clear to the most intelligent man if he is firmly persuaded that he knows already, without a shadow of doubt, what is laid before him.

Both salvation and punishment for man lie in the fact that if he lives wrongly he can befog himself so as not to see the misery of his position.

Conceit is incompatible with understanding.

You see, if you take pains and learn in order to get a reward, the work will seem hard; but when you work... if you love your work, you will find your reward in that.

Can it be that I have overlooked something, that there is something which I have failed to understand? Is it not possible that this state of despair is common to everyone?

I'm getting old, that's the thing! What's in me now won't be there anymore.

There is only one time that is important -- NOW! It is the most important time because it is the only time hat we have any power.