one's own
賢者は己の失策から学ぶ。
A wise person learns from their mistakes.
己の罪を考えろ
Consider your own sins.
— ウィッチ (2016)
他人を己のように扱うという道理を
the principle of treating others as you would yourself
— イップ・マン 序章 (2008)
己の慣習でないものを、人は野蛮と呼ぶ。
People call anything that is not their own custom barbaric.