The development of quantum mechanics early in the twentieth century obliged physicists to change radically the concepts they used to describe the world.
... the public and the private worlds are inseparably connected ... the tyrannies and servilities of the one are the tyrannies and servilities of the other.
Two attempts have been made in the world to found social life: the one was upon religion, and the other was upon social necessity. The one was founded upon spirituality, the other upon materialism; the one upon transcendentalism, the other upon realism.
When you get free from certain fixed concepts of the way the world is, you find it is far more subtle, and far more miraculous, than you thought it was.