Most people imagine focus as a matter of attention—pointing your mind's beam in one direction. But Jobs recognized something subtler: that focus is fundamentally an *act of rejection*. Every yes to something worthwhile means dozens of no's to plausible alternatives, and the person who succeeds isn't the one with the strongest willpower but the one willing to disappoint others early and often. Watch a cluttered designer's portfolio against a master's, and you'll see the difference isn't talent—it's the courage to leave things out, to let good ideas die so the essential ones can breathe.