The real wisdom here isn't about positive thinking—it's about recognizing that certain thoughts are *parasitic*, feeding on your energy while offering nothing in return. A persistent worry about what someone said three years ago, or the habit of rehearsing arguments you'll never have, doesn't merely distract; it actively weakens you by displacing the mental space you need for actual decisions. When you catch yourself circling the same anxious thought for the hundredth time, you're not being prudent or careful—you're simply training yourself to be smaller. The trick is distinguishing between thoughts worth sitting with (the difficult ones that build character) and thoughts worth releasing (the ones that only diminish you).