I write for the same reason I breathe - because if I didn't, I would die. - Isaac Asimov

All sources of energy in our Universe run down. We can't help that. Everything is
downhill in just one direction, and we can force a temporary uphill, backward, only by
taking advantage of some greater downhill in the vicinity. If we want useful energy
forever, we need a road that is downhill both ways. That is a paradox in our Universe; it
stands to reason that whatever is downhill one way is uphill going back.

When people thought the Earth was flat, they were wrong. When people thought the Earth was spherical they were wrong. But if you think that thinking the Earth is spherical is just as wrong as thinking the Earth is flat, then your view is wronger than both of them put together

Ambitious men will not wait and unscrupulous men will not hang back. By their every action they will hasten the decay of the worlds.