“Attached to over-doing it?
Better not do it at all!”
It is better to do nothing than to do something wrong. This is why mastering restraint is one of the most important things a Taoist can ever learn.
Restraint is all about prevention and self-control. It is about not doing something we would otherwise very much like to do. If you feel angry or frustrated, and would like to express your anger and frustration through violence, then you know beforehand that such an action would have bad consequences. If you hit someone, there will be pain. Causing another being pain engenders bitterness, resentment, enmity, and fear. It could even lead to a life-long feud that just grows ever more dangerous and complex. Your life would be so much simpler if you had just not done it!
You desire to eat or drink something that you know is unhealthy. You know that it will make you sick, and that consuming it on a regular basis will fuck up your health and make functioning easily much more difficult. But, if you go ahead anyway, letting your desires govern you instead of your wisdom, then you are knowingly permitting danger and disharmony to become a part of your life, developing asthma, diabetes, obesity, atherosclerosis, and any number of related health problems. Once again, you save yourself so much pain and interference, simply by not doing something!
So restraint is non-action. Not acting unnecessarily, only acting when it is essential to act, we keep our lives simple, and avoid amassing chaos and complexity. Over-doing things always invites destruction. The original Chinese here uses the metaphor of filling a vessel beyond its capacity. If you blow up a balloon beyond its capacity to stretch, it will burst. If you fill a pool beyond its capacity, it will flood. If you fill a belly beyond its capacity, you will get fat and sick. If you act beyond your capacity, you will wear yourself out. If you have sex beyond your capacity, you will drain your vital force.
If we follow the way of balance and restraint, we fill things to their capacity, and then no more, if indeed we must fill them at all. Making sure things do not transgress their limits, how much benefit we gain by simply not doing stupid things!