What is intelligence, and what is it to act intelligently (skillfully, sensibly, rationally, wisely, etc.)? This paper articulates and defends general intellectualist answers to these questions. Opposition to intellectualism is often motivated by Ryle's argument that intellectualism entails an infinite regress of intellectual operations. The central challenge is to identify an intellectualist-friendly regress-stopping state, and to explain how it could possibly halt the regress. I will suggest that this state is knowledge how, and that a possible explanation emerges through a clearer view of the connections between knowledge how, understanding, concept possession, and action.