Sinatra's real advice isn't about suppressing anger—it's about honoring it as information rather than fuel. The crucial move comes in that middle clause: you must *feel* the full force of your indignation before you can genuinely release it. A colleague takes credit for your work; you don't smile and pretend it didn't sting, nor do you scheme for payback. Instead, you let yourself be furious for an afternoon, which paradoxically makes moving forward possible rather than a performance of forgiveness you'll resent for months. The man understood that bottled anger doesn't disappear—it just ages poorly, like cheap wine.