Journey to the West, a 16th Century Chinese novel attributed to Wu Cheng'en, includes this passage:

Do good a thousand days,
But the good is still insufficient;
Do evil for one day,
And that evil is already excessive.

A simple, guiding truth with the resonance of five hundred years. It’s worth taking to heart.

Keep doing good.

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Hat tip to my father, who recently shared this quote with me. Thanks, Dad.