When you know for yourselves, 'These things are wholesome; these things are blameless; these things are praised by the wise; these things, if undertaken and practiced, lead to welfare and happiness,' then you should engage in them.
The mentor can be identified by four things: by restraining you from wrongdoing, guiding you towards good actions, telling you what you ought to know, and showing you the path to heaven.
Monks, one thing, if practiced and made much of, conduces to great thrill, great profit, great security after the toil, to mindfulness and self-possession, to the winning of knowledge and insight, to pleasant living in this very life, to the realization of the fruit of release by knowledge. What is that one thing: It is mindfulness centered on the body.