“Silly things do cease to be silly if they are done by sensible people in an impudent way”

“Improvement makes straight roads; but the crooked roads without improvement are roads of genius”

“The true method of knowledge is experiment.”

“What is now proved was once only imagined.”

“We are growing serious, and let me tell you, that's the very next step to being dull”

“Some day science may have the existence of mankind in power, and the human race can commit suicide by blowing up the world”