Full Idea
Pleasure-seekers desperately and violently seek satisfaction in unreal things for a part of themselves which is also unreal - a leaky vessel they're trying to fill.
Gist of Idea
Pleasure-seekers desperately seek illusory satisfaction, like filling a leaky vessel
Source
Plato (The Republic [c.371 BCE], 586b)
Book Reference
Plato: 'Republic', ed/tr. Waterfield,Robin [OUP 1993], p.335
A Reaction
Plato dreams of some enduring 'satisfaction' which never fades. He should have attended more to Heraclitus, and less to Parmenides.