You just have to know. And when you don’t know? No one can fault you for it. You do what you can, when you can, while you can. When you can’t, you can’t.
Chandra Wilson, Grey’s Anatomy
Sometimes, if you stand on the bottom rail of a bridge & lean over to watch the river slipping slowly away beneath you, you will suddenly know everything that needs to be known.
A.A. Milne, Winnie the Pooh