Give your attention to something often enough and it begins to shape you. Athletes know this. Musicians know this. The science of memory says it plainly, and it turns out to explain a small but deliberate choice Moroni made in his final invitation.

Each time you recall an experience, you strengthen your ability to recall it again. Memory researcher Charan Ranganath shows in his 2024 book Why We Remember that retrieval is one of the most powerful tools we have for learning. A memory you revisit becomes more available, quicker to surface, more woven into the way you see. The mind keeps and sharpens what you return to. And because memory is the lens through which we read the present, what you rehearse slowly becomes the frame you use for everything else. A person who rehearses grievances grows skilled at finding them. A person who rehearses gratitude grows skilled at noticing gifts.

There is a sobering version of this and a hopeful one. The sobering version: a wound replayed often enough wears a deep channel, and the mind learns to slide back into it at the smallest cue. The hopeful version: the same machinery works for good. Rehearse a kindness, a deliverance, a moment of grace, and it grows quick to surface as well, ready to steady you the moment you need it.

We become practiced at whatever we keep bringing to mind. That makes the choice of what to rehearse a decision with real consequences.