Full Idea
Both intellect and pleasure are completely absolved of being the good itself, since they both lack independence, that is, sufficiency and perfection.
Gist of Idea
Neither intellect nor pleasure are the good, because they are not perfect and self-sufficient
Source
Plato (Philebus [c.354 BCE], 67a)
Book Reference
Plato: 'Philebus', ed/tr. Waterfield,Robin [Penguin 1982], p.149
A Reaction
This seems to be Plato disagreeing with Socrates, who sees reason and intellect as central to morality. Presumable he means that the good should be a primitive. Why is pleasure not sufficient?