Full Idea
Immoderate desire is the mark of a child, not a man.
Gist of Idea
Immoderate desire is the mark of a child, not an adult
Source
Democritus (attrib) (reports [c.250 BCE], B070)
Book Reference
'Ancilla to the Pre-Socratic Philosophers', ed/tr. Freeman,Kathleen [Harvard 1957], p.101
A Reaction
Not factually correct, since the world is full of adults who have immoderate desires (notably for money). However, there are plenty of grown ups who don't seem very adult.