"The universe is a symphony of interconnectedness."

"What is the good of a scientific discovery that does not make a difference in everyday life?"

"An important scientific innovation rarely makes its way by gradually winning over and converting its opponents: it rarely happens that Saul becomes Paul."

"The quantum hypothesis will never be understood until one realizes that it is only a provisional stopgap."

"The quantum of action, as I called it, was a purely formal assumption and I really did not think much about it."