Hanja/恕

恕

 * 1) (용서할 서) to forgive
 * 2) (헤아릴 서) to infer, reason
 * 3) (어질 서) to be considerate, sympathize
 * 4) * 論語/衛靈公第十五
 * 子貢問曰 有一言而可以終生行之者乎. 子曰 其恕乎 己所不欲勿施於人.
 * 자공문왈 유일언이가이종생행지자호. 자왈 기서호 기소불욕물시어인.
 * Zigong asks if there is a single word worth doing for life. Confucius says that it is considerateness -- what one wouldn't like shouldn't be done to the other.

Wiktionary

 * 己所不欲勿施於人
 * 역지사지
 * do unto others as you would have them do unto you