For science can only ascertain what is, but not what should be, and outside of its domain value judgments of all kinds remain necessary. Religion, on the other hand, deals only with evaluations of human thought and action: it cannot justifiably speak of facts and relationships between facts.

Anyone can be a genius, if they pick just one specific subject and study it diligently just 15 minutes each day.

What is essential in the life of a man of my kind is what he thinks and how he thinks, and not what he does or suffers.

I myself should also be dead already, but I am still here.

Anybody who really wants to abolish war must resolutely declare himself in favor of his own country's resigning a portion of sovereignty in place of international institutions.

What I'm really interested in is whether God could have made the world in a different way; that is, whether the necessity of logical simplicity leaves any freedom at all.

I get the most joy in life out of music.