Who said "Be quicker to a friend's bad day than his good one."?

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

What is the original Greek?

ταχύτερον ἐπὶ τὰς ἀτυχίας τῶν φίλων ἢ ἐπὶ τὰς εὐτυχίας πορεύεσθαι. Translated from the original Greek by Spartan Surfers.

Be quicker to a friend's bad day than his good one.

Chilon, Diogenes Laertius 1.70

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The source

"Be quicker to a friend's bad day than his good one." Chilon said it in Diogenes Laertius 1.70. Translated from the original Greek by Spartan Surfers.

"ταχύτερον ἐπὶ τὰς ἀτυχίας τῶν φίλων ἢ ἐπὶ τὰς εὐτυχίας πορεύεσθαι."

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 "Be quicker to a friend's bad day than his good one."?: Chilon (8th–4th century BC). Source: Diogenes Laertius 1.70.
What is the original Greek?: ταχύτερον ἐπὶ τὰς ἀτυχίας τῶν φίλων ἢ ἐπὶ τὰς εὐτυχίας πορεύεσθαι. Translated from the original Greek by Spartan Surfers.