Part One -- 1. Plato and neoplatonism -- 2. The good, the forms, and Eros in Plato -- 3. The one, Eros, and the progression of the soul in Plotinus -- Part Two -- 1. Knowing how and knowing that -- 2. Virtue in the middle and late dialogues -- 3. The disintegration of the Platonic doctrine of virtue and knowledge -- 4. Plotinus and virtue -- Part Three -- Origen -- Epilogue.