Physiology and the controlling of affects in Kant's philosophy

Kant is categorical about the relation between virtue and the controlling of inclinations:Since virtue is based on inner freedom it contains a positive command to a human being, namely to bring all his capacities and inclinations under his reason's control and so to rule over himself. Virtue presupposes apathy, in the sense of absence of affects. Kant revives the stoic ideal of tranquilitas as a necessary condition for virtue: ‘The true strength of virtue is a tranquil mind’ . In the Anthropology and the Doctrine of Virtue, apathy is taken in the sense of freedom from affects. In these texts, Kant maintains that we must strive toward a state in which affects are absent