" Curly: Do you know what the secret of life is? Mitch: No. What? Curly: This. [He holds up one finger.] Mitch: Your finger? Curly: One thing. Just one thing. You stick to that and everything else don’t mean sh*t. Mitch: That’s great, but what’s the “one thing”? Curly: That’s what you’ve got to figure out. "

― Gary Keller , The One Thing: The Surprisingly Simple Truth Behind Extraordinary Results