He had seen too much of the cosmos to have any great faith in man's ability to understand it.

“Two lives met across death and centuries. To ask what it meant is meaningless. There is no destiny. But sometimes there is bravery.”

“I am told that our chroniclers' practice of inventing speeches for great persons whose lives they write is unscholarly.”

When facts are insufficient, theorizing is ridiculous at best, misleading at worst.

If we knew exactly what to expect throughout the Solar System, we would have no reason to explore it.

“A fanatic is a man who, when he's lost sight of his purpose, redoubles his effort.”

I have yet to see any problem, however complicated, which, when looked at in the right way did not become still more complicated.