Do not find fault with others. If they behave wrongly,
there is no need to make yourself suffer. If you point out to them what is correct
and they do not practice accordingly, leave it at that. When the Buddha studied
with various teachers, he realised that their ways were lacking, but he did not
disparage them. Studying with humility and respect, he benefited from his relationship
with them, yet he realised that their systems were not complete. Still, he had
not yet become enlightened, he did not criticise or attempt to teach them. After
he found enlightenment, he respectfully remembered those had studied with and
wanted to share his newfound knowledge with them.
- Ajahn Chah.