Learn To Differentiate
If your mind is focused on an insignificant incident, it can destroy your happiness if you allow it to. To feel happy, your mind has to be free of pains and misfortunes.
Learn to differentiate between productive thinking about problems as a means of solving them, and counterproductive dwelling on misfortunes which gains nothing positive and destroys your quality of life.
"A bias shall not be considered a hindrance, so long as it does not walk hand-in-hand with ignorance"
- a horribly wise man
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