Ah yes, intuition. That's definitely something that could never possibly be off and it should definitely be used to decide whether or not to toy with the universe.
Get used to it. You'll be me in a few years and I think if you go around hating yourself it won't be long before it's the next face's turn.
[He steels his shoulders, grabbing the other by his jacket and pulling him close.] And you don't even realize just how much you risked. How many people, Doctor? How many loved ones of yours? You see, you might be fine with taking a chance on losing them or ruining what they hold dear, but I am not. If that makes me old and grumpy, or even too old, I can live with that. But if you keep on taking chances like that all on a whim, I suggest you change your name and do it now. Understood?
[He can't help but roll his eyes at the other, shaking his head with a sigh as he let's go of his coat, taking a step back.] And here I was sort of hoping we could come up with something a bit more original than that.