Why do monks abstain from alcohol, lust, lust and meat?

This is the requirement of Buddhism's three conversions and five precepts: all Buddhists must achieve three conversions and five precepts. Third, conversion is to convert to the three treasures of Buddhism, dharma and monks; The five precepts are no killing, no stealing, no lewdness, no lying and no drinking.

Specifically, the spiritual requirements of the five commandments are: kindness does not kill; Do not steal and benefit; Ritual without lewdness; Honesty without lying; It is wise not to drink.