聖人學會三戒:
A sage should observe three stages of self discipline.
少之時,血氣初定,戒之在色;
In youth, his physical capability is not fully settled and he should guard against lust.
壯年也,血氣方剛,戒之在爭;
In his prime when his physical capability is solid, he should guard against contention.
其老也,血氣漸衰,戒之在得。
In old age his physical capability is declining, he should guard against greed.