A loss hurts once. A shameful gain hurts forever.

The source

"A loss hurts once. A shameful gain hurts forever." Chilon said it in Diogenes Laertius 1.70. Translated from the original Greek by Spartan Surfers.

"ζημίαν αἱρεῖσθαι μᾶλλον ἢ κέρδος αἰσχρόν· ἡ μὲν γὰρ ἅπαξ ἐλύπησε, τὸ δὲ διὰ παντός."

Original Greek, Diogenes Laertius 1.70. Greek: Hicks 1925 Loeb text via Perseus.

Who said it

The Spartans (8th–4th century BC). Laconic sayings from Lycurgus, Leonidas, Dienekes and the mothers of Sparta, recorded by Herodotus and Plutarch.

Questions

Who said "A loss hurts once. A shameful gain hurts forever."?

Chilon (8th–4th century BC). Source: Diogenes Laertius 1.70.

What is the original Greek?

ζημίαν αἱρεῖσθαι μᾶλλον ἢ κέρδος αἰσχρόν· ἡ μὲν γὰρ ἅπαξ ἐλύπησε, τὸ δὲ διὰ παντός. Translated from the original Greek by Spartan Surfers.