It is the mark of a child not an adult to desire without measure.

[Παιδός, οὐκ ἀνδρὸς τὸ ἀμέτρως ἐπιθυμεῖν.]

Democritus (c. 460 BC - c. 370 BC) Greek philosopher

Frag. 70 (Diels) [tr. @sententiq (2018), fr. 69]
    (Source)

Diels citation "70. (62N.) Demokrates. 35." Alternate translations:

• "Immoderate desire is the mark of a child, not a man." [tr. Freeman (1948)]
• "It is a characteristic of a child, not a man, to desire without measure." [tr. Chitwood (2004)]