Economics (1.3.4-1.4.1)

At the same time Nature, by this cycle of changes, fulfills her purpose of perpetuating existence; preserving the type when she is unable to preserve the individual.[*] And so with this purpose in view Divine Providence has fashioned the nature of man and of woman for their partnership. For they are distinguished from each other by the possession of faculties not adapted in every case to the same tasks, but in some cases for opposite ones, though contributing to the same end. For Providence made man stronger and woman weaker,

We begin then with the rules that should govern a man’s treatment of his wife. And the first of these forbids him to do her wrong; for if he observes this, he is not likely himself to suffer wrong at her hands. As the Pythagoreans declare, even the common rule or custom of mankind thus ordains, forbidding all wrong to a wife as stringently as though she were a suppliant whom one has raised from the hearthstone. And a man does wrong to his wife when he associates with other women.