Once we accept our limits, we go beyond them.
I am satisfied with the mystery of the eternity of life.
The time comes in life when we have read enough. It's time to stop reading. It's time to lay down the books and write.
The only real valuable thing is intuition.
Work is the only thing that gives substance to life.
The truth of a theory can never be proven, for one never knows if future experience will contradict its conclusions.