Person of Interest, Season 4

Harold Finch:
There are more possible games of chess than there are atoms in the universe. No one could possibly predict them all, even you. Which means that that first move can be terrifying. It's the furthest point from the end of the game. There's a virtually infinite sea of possibilities between you and the other side. But it also means that if you make a mistake there's a nearly infinite amount of ways to fix it. So you should simply relax and play.