Full Idea
There are three main things which are intrinsically good - virtue, knowledge, and with certain limitations, pleasure.
Gist of Idea
The three intrinsic goods are virtue, knowledge and pleasure
Source
W. David Ross (The Right and the Good [1930], §II)
Book Reference
Ross,W.David: 'The Right and the Good' [OUP 1930], p.24
A Reaction
This combines the views of most of the main schools of ancient Greece. For Socrates, knowledge delivers the others; for Aristippus, pleasure eclipses the others; for Zeno of Citium, virtue is all that matters. Ross is a pluralist, like Aristotle.