The person you become depends heavily on which thoughts you stop entertaining.

Attention is the food of a thought. Some ideas would fade in a minute if left alone, and they only become permanent because you kept picking them up, turning them over, and following where they led. What you stop entertaining shapes you as much as what you pursue, and the stopping is quieter, which is why it goes unnoticed. Growth is partly a matter of what you declined to think about.

Identify the loop that takes the most of your day, the grievance, the comparison, the imagined argument. You do not have to defeat it, only decline the next invitation. Put your attention somewhere real and let the loop go hungry.