Third Part: Concerning Commutative Justice

277. Commutative justice regards commutations in which it establishes and preserves the due equality toward another. But commutations, or operations by which something is transferred from one to another, are some involuntary, others voluntary. Hence we shall speak:

1. of the act of commutative justice by which due equality is established or rendered, namely, of restitution;

2. of justice and injustice in involuntary commutations;

3. of justice and injustice in voluntary commutations.