“Truths are as much a matter of questions as answers.”

“...[T]hese people... are my dangerous accusers because those who hear them suppose that anyone who inquires into such matters... theories about the heavens... and everything below the earth... must...”

“As it is, the lover of inquiry must follow his beloved wherever it may lead him.”

“I feel like every project I work on is a dream project, so long as I am learning.”

“Love, too, has to be learned.”

“Every pain is a lesson.”

“I do not know what I may appear to the world, but to myself I seem to have been only like a boy playing on the sea-shore, and diverting myself in now and then finding a smoother pebble or a prettie...”

“To know the history of science is to recognize the mortality of any claim to universal truth. ”

“The scientist only imposes two things, namely truth and sincerity, imposes them upon himself and upon other scientists.”