Q: Sometimes I worry about the monks' discipline. If I kill insects accidentally, is this bad?
Answer: Sila or discipline and morality are essential to our practice,but you must not cling to the rules blindly. In killing animals or in breaking other rules, the important thing is intention. Know your own mind. You should not be excessively concerned about the monks' discipline. If it is used properly, it supports the practice, but some monks are so worried about the petty rules that they can't sleep well. Discipline is not to be carried as a burden. In our practice here the foundation is discipline, good discipline plus the ascetic rules and practices. Being mindful and careful of even the many supporting rules as well as the basic 227 precepts has great benefit. It makes life very simple. There need be no wondering about how to act, so you can avoid thinking and instead just be simply mindful. The discipline enables us to live together harmoniously; the community runs smoothly. Outwardly everyone looks and acts the same. Discipline and morality are the stepping stones for further concentration and wisdom. By proper use of the monks' discipline and the ascetic precepts, we are forced to live simply, to limit our possessions. So here we have the complete practice of the Buddha: refrain from evil and do good, live simply keeping to basic needs, purify the mind. That is, be watchful of our mind and body in all postures: sitting, standing, walking or lying, know yourself.
— Questions & Answers with Ajahn Chah
