The Tao, Chapter 33
Those who know others are intelligent;
those who know themselves are truly wise.
Those who master others are strong;
those who master themselves have true power.
Those who know they have enough are truly wealthy.
Those who persist will reach their goal.
Those who keep their course have a strong will.
Those who embrace death will not perish,
but have life everlasting.
— Translated by J. H. McDonald