Niels Bohr — "Every sentence I utter must be understood not as an affirmation, but as a questi…"

"The meaning of life does not consist in the mere fact of existing, but in the power of perceiving and making known our existence, and that of others."

"The only way to avoid error is to acquire experience, and the only way to acquire experience is to make errors."

"There are trivial truths and great truths. The opposite of a trivial truth is plainly false. The opposite of a great truth is also true."

"The ultimate goal of science is to understand the universe and our place in it."

"The atom is a tiny planetary system. The electrons revolve around the nucleus just as the planets revolve around the sun."