"In that case, on behalf of Earthlife, I urge that, with full knowledge of our limitations, we vastly increase our knowledge of the Solar System and then begin to settle other worlds."
"There are no forbidden questions in science, no matters too sensitive or delicate to be probed, no sacred truths."
"If it can be destroyed by the truth, it deserves to be destroyed by the truth."
"I don't want to believe. I want to know."
"A celibate clergy is an especially good idea, because it tends to suppress any hereditary propensity toward fanaticism."
"You can get into a habit of thought in which you enjoy making fun of all those other people who don't see things as clearly as you do. We have to guard carefully against it."