There are two basic motivating forces: fear and love. When we are afraid, we pull back from life. When we are in love, we open to all that life has to offer with passion, excitement, and acceptance.
Lennon identifies something subtler than a simple good-versus-evil choice: he's describing two opposing directions our whole being can move in, not just two feelings we might experience. Fear contracts us—it narrows our focus, makes us defensive, turns us inward. Love does the opposite, making us willing to risk disappointment and loss because connection matters more than safety. You see this played out in quiet ways—the colleague who never speaks up in meetings because fear of judgment has closed them off, versus the person who shares an unpopular idea knowing they might be wrong, but trusting that the conversation itself has value. The quote's real power lies in suggesting that every choice we make, from the smallest to the largest, is fundamentally about which direction we're choosing to move.