Tim Ferriss has found a great way to remove negative thoughts from your day:

Will designed a solution in the form of a simple purple bracelet, which he offered to his congregation with a challenge: go 21 days without complaining. Each time one of them complained, they had to switch the bracelet to their other wrist and start again from day 0. It was simple but effective metacognitive awareness training.

You give yourself feedback when you complain — your mind learns. A simple and effective metacognitive feedback loop.

This is a variant of Aleister Crowley‘s exercise — he proposes that you carry around a pair of scissors and stab yourself in the hand every time you speak about yourself. I prefer the bracelet version, which is just as effective. You don’t need negative feedback, only consistent feedback.  In this post, I examine some guidelines for setting up a feedback exercise for yourself.