Transitions should be marked, milestones commemorated, and pits filled. That’s the essence of thinking in moments. Defining moments shape our lives, but we don’t have to wait for them to happen. We can be their authors. We can engineer these moments—or at least create the conditions for them to emerge. To create more and more powerful defining moments, we need to become “moment-spotters”—learn to spot occasions to invest in. Our focus on goals can blind us to the possibility of a given moment—even as moments can support the achievement of goals.