How do you use your brain capacity?

It is a myth that we only use 10% of our brain capacity. We are always using our whole brains.
But that doesn't mean we can't do better. We use a lot of our brain capacity for unproductive and harmful things. We use our brains to rationalize hate. We use our brains to put ourselves down for not being perfect. We use our brains to rationalize irrational beliefs and behaviour.