Following one's heart's desires without transgressing the bounds—what level of attainment is this?

"Ju" means rules and discipline. Some people can restrain themselves to keep to the rules, while others need no restraint—they act freely according to their nature, yet never overstep the rules or violate them. When the manas has been tamed and afflictions eliminated, whatever one does will not transgress the boundaries of the rules; the mind no longer accords with afflictions and will not create afflicted karma. Without a mind of afflictions, there is no afflicted karma. It is like an ox that, once tamed, will spontaneously refrain from trampling crops even without anyone watching or supervising; it is like a monkey that, once tamed, will never run wild again.