To do good, not to do evil
To purify mind,
This is the teaching of all the Buddha's.
Naturally this scholar had expected a much more 'profound' answer, something deep and abstruse, and he remarked that even a child of three could understand that. But the sage replied that while a child of three could understand it, a man of eighty could not practice it !
-he must not take the life of any living creature knowingly;- he must not take anything not given-he must refrain from lying and harsh frivolous speech;-he must guard against sexual misdemeanor;-he must no take anything (like drugs and liquor) which causes him to lose his mindfulness.