I don't understand why this is a precept. (It is taken from Thailand's Northern Insight Meditation Centre)
In my stomach right now is a war between my immune system and hundreds of thousands of small organisms ... it is a slaughter, every second I kill many many creatures. This is the nature of my body.
....
So I don't understand why this is a precept. I would prefer something like "maintain mindfulness".
Rideforever,
This precept came about from the Buddha's understanding of karma, of which
intent figures prominently.
If our intention is to harm other living creatures, simply for our own pleasure or benefit, then our lives are on a certain track. We have a certain karma.
If we constantly keep harming other living creatures, but we are ignorant of that fact, and if only we knew better then we would alter our behavior, then our life is set on another track. A different karma.
The Buddha teaches harmlessness, the highest track, which means not only harmlessness in our physical actions, but in speech and thought, too.
By following the precepts, we take care of harmlessness of our physical actions. The meditation taught by the Buddha is designed to take care of harmlessness on the subtler and subtlest levels: speech and thought. Gradually, we leave one track and get on a different, higher one; we change our karma.
For an everyday practitioner, it is important to understand these are trainings, so as to avoid disappointment and feelings of defeat and hopelessness. Just like one starts out training for a marathon by jogging a mile, then gradually increase this according to our ability, two miles, then three miles. We are not perfect just because we take the triple gem and the five precepts, just like we can't necessarily complete a marathon in record time just by registering for the event. We accept whatever shortcomings we have and try again and again over time. Training with self discipline and understanding.
The Buddha taught we should try not to use the precepts as an excuse to avoid this training. Instead, we should try to follow the precepts to the best of our ability. But the practical aspect of training the mind is of utmost importance.
A story from the time of the Buddha illustrates the point:
A new monk got his meditation instructions from the Buddha and went out into the forest to find a tree to meditate under. The first tree he found suitable had lots of ants crawling around. He thought, 'if I sit here, I will kill so many ants!' So he searched for another tree. Next tree had some other insects, and so on. The whole day was spent looking for the perfect shady meditation spot.
In the evening when the Buddha asked him how his meditation had been that day, he answered he hadn't done any meditation, he was too busy taking care of this precept.
Similarly, one can go through life trying to save the world while neglecting ones own practice.
Help others by helping oneself first.