Blushing? Courage. That's the color of virtue.

The source

"Blushing? Courage. That's the color of virtue." Diogenes said it in Diogenes Laertius, Lives 6. Translated by C. D. Yonge, 1853.

"Once he saw a youth blushing, and addressed him: Courage, my boy, that is the complexion of virtue"

C. D. Yonge, 1853, Diogenes Laertius, Lives 6. Anecdote reported by Diogenes Laertius (3rd century AD).

Who said it

Diogenes (c. 412–323 BC). The Cynic who lived in a jar in Athens and told Alexander the Great to get out of his sun.

Questions

Who said "Blushing? Courage. That's the color of virtue."?

Diogenes (c. 412–323 BC). Source: Diogenes Laertius, Lives 6.

What is the original wording?

Once he saw a youth blushing, and addressed him: Courage, my boy, that is the complexion of virtue (C. D. Yonge, 1853). Translated by C. D. Yonge, 1853.