The first two chapters of Genesis are excellent.

But I also take a birds eye view of key figures, the legislative texts, Wisdom literature, and the prophets.

Natural Law: God has an eternal, beautiful wise plan with which He created the universe. He placed this plan in our very being. We have the intellect to recognize it and the freedom to participate in it.

The ends of marriage are (1) the procreation and education of children, (2) the mutual help of the spouses

There are two properties of marriage: (1) exclusivity, and (2) permanence.

There are three goods of marriage: offspring, fidelity, and the sacrament.

Because marriages naturally result in children, which have an impact on the larger society, society has a right and duty to have reasonable policies and legislation protecting marriage and the family.

We start pretty fast!

It's clear that marriage is hurting as an institution: fewer marriages later in life with less children and more divorces... Tough times...

Why? In addition to the selfishness and weakness of the flesh of all times, there is the perceived increase in the expectation of the necessities of life, individualism with its inability to trust and fear of commitment, the objectification of women with pornography, technology that make the fruitfulness of option perceived as optional, and we don't prioritize sacrifice.

It comes from a dualism and a materialism.

And Pope St John Paul II shows up and brings the Theology of the Body in the nic of time!
1) Dignity of the human person
2) We are soul and body
3) There are two ways of being body--male and female
4) The sexual differences reveal the "spousal meaning of the body", that is, we are meant to be gift
5) The spousal meaning of the body is fulfilled with the mutual gift resulting in marriage, a communion of persons, which mirrors the Trinity
6) Sin ruins this plan, specifically lust which causes an alienation between man and woman.
7) But Jesus sets us free and restores what has been broken/wounded.