Ted : "I used to believe in destiny, you know ? […]"
Robin : "You've just been focused on work."
Ted : "No, it's more than that. I stopped believing. Not in some depressed I'm-gonna-cry-during-my-toast way. Not in a way I even noticed until tonight. It's just, every day I think I…believe a little less, and a little less, and a little less, and that sucks. What do I do about that, Scherbatsky ?"
Robin : "You're Ted Mosby. You start believing again."
Ted : "In what ? Destiny ?"
Robin : "Chemistry. If you have chemistry, you only need one other thing."
Ted : "What's that ?"
Robin : "Timing. But timing's a bitch."