Since I have introduced this term I had always a bad conscience. . . . I cannot help to feel it strongly and I am unable to believe that such an ugly thing should be realized in nature.

My comprehension of God comes from a deeply felt conviction of a superior intelligence that reveals itself in the knowable world.

This is what the painter, the poet, the speculative philosopher, and the natural scientists do, each in his own fashion.

My deep religiosity [...] found an abrupt ending at the age of twelve, through the reading of popular scientific books.

The most difficult part about understanding something is that we understand it all.

Learn from yesterday, live for today, hope for tomorrow. The important thing is not to stop questioning.

I have no special talent. I am only passionately curious. The important thing is to not stop questioning. Curiousity has its own reason for existing.