We have found that where science has progressed the farthest, the mind has but regained from nature that which the mind put into nature.

An ocean traveler has even more vividly the impression that the ocean is made of waves than that it is made of water.

A hundred thousand million Stars make one Galaxy; A hundred thousand million Galaxies make one Universe. The figures may not be very trustworthy, but I think they give a correct impression.

I don't believe any experiment until it is confirmed by theory. I find this is a witty inversion of "conventional" wisdom.

There was a time when we wanted to be told what an electron is. The question was never answered. No familiar conceptions can be woven around the electron; it belongs to the waiting list.

Events do not happen; they are just there, and we come across them.

If I let my fingers wander idly over the keys of a typewriter it might happen that my screed made an intelligible sentence. If an army of monkeys were strumming on typewriters they might write all the books in the British Museum. The chance of their doing so is decidedly more favourable than the chance of the molecules returning to one half of the vessel.