Today is the first day of the rest of your life.
The real power here lies in *permission*—Dederich isn't asking you to feel hopeful so much as to feel absolved of yesterday's failures. When someone struggling with addiction hears this (Dederich founded Synanon, an early recovery community), it means their relapse last week needn't predict tomorrow. The phrase stops being motivational poster fodder the moment you realize it's actually radical: you're not building on a foundation of past mistakes; you're allowed to abandon that foundation entirely. A person returning to work after months of depression understands this differently than someone merely bored on a Monday morning—for them, the quote is less inspiration and more oxygen.