Bodhinyana

It is not proper to watch other people. This will not help your practice. If you are annoyed, watch the annoyance in your own mind. If others' discipline is bad or they are not good monks, this is not for you to judge. You will not discover widsom watching others. Monks' discipline is a tool to use for your own meditation. It is not a weapon to use to criticize or find fault. No one can do your practice for you, nor can you do practice for anyone else. Just be mindful of your own doings. This is the way to practice.
- Ajahn Chah, "Bodhinyana"