If we long for our planet to be important, there is something we can do about it. We make our world significant by the courage of our questions and by the depth of our answers. Cosmos (1980)
If a marker were to be erected today, it might read, in homage to his scientific courage: “He preferred the hard truth to his dearest illusions.” Cosmos (1980)
We can judge our progress by the courage of our questions and the depths of our answers, our willingness to embrace what is true rather than what feels good. Misattributed