A few quotes that aren’t about writing, but I think apply to writing and worldbuilding very well.
“Monsters serve both to mark the fault-lines but also, subversively, to signal the fragility of such boundaries.” -Elaine Graham
“Humans need fantasy to be human. To be the place where the falling angel meets the rising ape.” -Terry Pratchett
“It is not the strongest of the species that survive, nor the most intelligent, but the ones most responsive to change.” -Charles Darwin
“Life is growth. If we stop growing, technically and spiritually, we are as good as dead.” -Morihei Ueshiba, O-Sensei