When I was a kid…I liked burning ants with a magnifying glass….but I think that progressed into adulthood where I now believe in aliens.

It's strictly the schoolboy syndrome [and] seems to last well into adulthood.

To realize that you are smarter than your boss but still must answer to him is an unnerving step in the world of adulthood.

Adults are just obsolete children and the hell with them.

I sometimes ask myself how it came about that I was the one to develop the theory of relativity. The reason, I think, is that a normal adult never stops to think about problems of space and time. These are things which he has thought about as a child.

To speak truly, few adult persons can see nature. Most persons do not see the sun. At least they have a very superficial seeing. The sun illuminates only the eye of the man, but shines into the eye and heart of the child.