They tune the lyre and leave the soul out of tune.

The source

"They tune the lyre and leave the soul out of tune." Diogenes said it in Diogenes Laertius 6.27. Translated from the original Greek by Spartan Surfers.

"τοὺς μουσικοὺς τὰς μὲν ἐν τῇ λύρᾳ χορδὰς ἁρμόττεσθαι, ἀνάρμοστα δʼ ἔχειν τῆς ψυχῆς τὰ ἤθη·"

Original Greek, Diogenes Laertius 6.27. Greek: Hicks 1925 Loeb text via Perseus.

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 "They tune the lyre and leave the soul out of tune."?

Diogenes (c. 412–323 BC). Source: Diogenes Laertius 6.27.

What is the original Greek?

τοὺς μουσικοὺς τὰς μὲν ἐν τῇ λύρᾳ χορδὰς ἁρμόττεσθαι, ἀνάρμοστα δʼ ἔχειν τῆς ψυχῆς τὰ ἤθη·. Translated from the original Greek by Spartan Surfers.