“And thus we arrive at the conclusion that virtue is either wholly or partly wisdom?”
Socrates arrives at a conditional suggestion that a good character may depend wholly or partly on wisdom. His question follows a discussion of how judgment guides courage and other qualities toward good outcomes. It is not a final definition: he soon reopens the question by doubting whether virtue can be taught and whether suitable teachers exist.
Source details
Plato, Meno, approximately Stephanus 89a; Socrates is questioning Meno after connecting the usefulness of virtues with wise guidance. The conclusion is provisional and is challenged shortly afterwards when they examine the absence of recognized teachers of virtue. Exact complete sentence in Benjamin Jowett English, Project Gutenberg #1643, dialogue proper (not translator introduction); the historical Plato is not the speaking character.