Let the wise one control his thoughts, for they are difficult to perceive, often elusive, and they rush about frantically: a mind well controlled achieves peace and happiness.
This is the entire spiritual life, Ananda, that is, good friendship, good companionship, good comradeship. When a monk has a good friend, a good companion, a good comrade, it is to be expected that he will develop and cultivate the Noble Eightfold Path.
If a man's thoughts are muddy, If he is reckless and full of deceit, How can he wear the yellow robe? Whoever is master of his own nature, Bright, clear and true, He may indeed wear the yellow robe.