Eckhart Tolle explains why your mind replays painful moments longer than happy ones. The inner voice dwells on being hurt or offended while positive events get only brief appreciation. This asymmetry means much of our mental activity stays negative by default.
Discover first of all that there is a voice in your head that indulges in self-talk. A good event that happened yesterday, you can remember it today and think, that was a beautiful sunset, or we had a nice talk yesterday. But you can't do that much thinking about a nice event. But the mind, when there's something negative that happens yesterday, somebody offended you, you can go on for a long time dwelling on something negative much longer than dwelling on something positive. And this is why for many people, a significant percentage of their mind activity is negative.
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