Consideration of habits and what makes a habit to be either a virtue or a vice, as well as sin and its punishment. ST I-II, qq.49-89.
The Summa is online [here]!
The First Part of the Second Part is [here]!
The difference of the passions of the concupiscible and irascible parts of the soul (q.23) [here], the nature of habits (q.49) [here], and how virtues perfect either the intellect or the will (q. 56) [here]. The nature of the gifts of the Holy Spirit (q.68) [here].
The punishment of sin (q. 87) [here].
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