Good friends, if you would cultivate imperturbability, just whenever you see people, do not see their right or wrong, good or bad, faults or troubles; then your own nature is immovable. Good friends, even though the bodies of deluded people be immobile, yet when they open their mouths to speak of the right and wrong, strengths and weaknesses, good and bad of other people, they turn away from the path. If you cling to mind or cling to purity, this veils the truth.
What is called sitting meditation? In this way there is no obstruction, no impediment. When outwardly, in the midst of all pleasant or unpleasant realms, thoughts do not arise in the mind, this is called “sitting.” Inwardly to see that one’s own nature does not move is called “meditation.”

- Hui-neng (638-713)