The best and most beautiful things in the world cannot be seen or even touched, but are felt in the heart.

Optimism is the faith that leads to achievement; nothing can be done without hope.

It is not possible for civilization to flow backwards while there is youth in the world. Youth may be headstrong, but it will advance it allotted length.

I do not want the peace which passeth understanding, I want the understanding which bringeth peace.

I like the guys who wrote their own stuff and were able to perform it, like Seth Rogen. He popped off so young. When he did 'The 40-Year-Old Virgin,' and he was a co-producer on the movie, I was like, 'Oh my God: that's exactly what I want to do.'

Nature and nature's laws lay hid in the night. God said, Let Newton be! and all was light!

Charity never humiliated him who profited from it, nor ever bound him by the chains of gratitude, since it was not to him but to God that the gift was made.

Men make opportunity. Every great industrial achievement has been the result of individual effort - the practical development of a dream in the mind of an individual.