Who is wise?
The Stanford Encyclopedia of Philosophy in its article on wisdom, after summarizing the main views there are about wisdom, concludes with a rigorous definition of what it means for someone to be wise. Someone is wise if and only if he/she:
1. Has extensive factual and theoretical knowledge.
2. Knows how to live well.
3. Is successful at living well.
4. Has very few unjustified beliefs.
As to what kind of factual and theoretical knowledge is implied, the previous quote by Nozick, which was actually found in the same article, provides ample examples.