[allhailkatt]

Stoicism. It's a practical philosophy where ability to be rational and do good work is considered the only goal worth pursuing, and incorporates mindfulness into that system to be able to pursue Virtue. Quotes from adherents include:

"If your body was turned over to just anyone, you would doubtless take exception. Why aren't you ashamed that you have made your mind vulnerable to anyone who happens to criticize you, that it automatically becomes confused and upset?"

"It is in your power whenever you choose to retire into yourself. For there is no retreat quieter or freer from trouble than a man's own soul."

Similar to Zen and Minimalism, but with the built-in goal of searching for virtue as the best way to live a life. It's the basis for modern CBT/DBT therapies as well. Good stuff.