"In a world where it is so easy to neglect, deny, corrupt and suppress the truth, the scientist may find his discipline severe. For him, truth is so seldom the sudden light that shows new order and beauty; more often, truth is the uncharted rock that sinks his ship in the dark. He respects all the more those who can accept that condition; and in returning thanks tonight we are saluting all those who make our load lighter by sharing it."
"Scientists have to doubt everything. They are the only people who thrive on being doubters... The business of scientists is not to believe, but to test, to check and challenge theories, including their own... it's very uncomfortable fro most people to live in a world of perpetual uncertainty, but for scientists, it is fundamental."
"If we are citizens of anything, we are citizens of the earth."