While practical wisdom is important, we also need action. Of all the pleasures in life, contemplation is the most continuous and self-sufficient. It aims at nothing outside of itself. It realizes a divine element in us. It directs our highest activity toward the highest objects.
Philosophical wisdom combined with a virtuous character is complete happiness.
The social good is more important than the individual good. Legislators are responsible for the proper moral upbringing of the citizens of the polis. Parents are responsible for the proper training of their children, habituating them in the virtues. Only citizens of the city-state have adequate leisure to pursue virtue and theoretical study. So only they can achieve their proper end of complete happiness.