Just one thing matters

"Just one thing matters: what you decide. If you believe something is frustrating or embarrasing, just decide it doesn't matter. Depending on the context, the things that worry you the most can lose all importance." - Thoughts kept

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This is the beginning of my strongest thought, something I'll call mental judo for now. Conveniently, looks like this is already a thing; I'll have to read about it soon. 

Judo is about "using your opponent's strength against them". In the case of mental judo, your opponents are your thoughts and problems; your "inner demons" some say. I need this a lot in my life.

You have the last word. It's not easy, but you can manipulate and change the importance you give to things.