If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
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The idea is your brain has a fast and slow part. System 1 is 'fast, instinctive, and emotional'. System 2 is 'slower, deliberative and logical'.
You have much better introspection of System 2 than of System 1. The first part of the post is suggesting you focus on introspecting these automatic quick reactions and strategizing around them.
The last part of the post is a not-very-funny joke based on HPMoR.