"The constant changes in the scientific worldview show how important it is to remain open to new ideas."

"Physics is a science of the real world, not of the subjective impressions of the individual."

"The human mind is capable of understanding the universe."

"A scientific truth is not a truth that is true in all possible worlds, but a truth that is true in our world."

"I started from the assumption that the energy of an oscillator is quantized. I did this in an act of desperation."