I did not know I was supposed to provide quotes by other people. I thought the goal was to generate my own. Here is one I like a lot that I didn't write.
“He who is certain he knows the ending of things when he is only beginning them is either extremely wise or extremely foolish; no matter which is true, he is certainly an unhappy man, for he has put a knife in the heart of wonder.” - Tad Williams, Dragonbone Throne