Medieval European thinkers inherited two big things: Greek philosophy about love (rigorous, secular) and Christian theology (love of God as the highest love). They spent centuries trying to figure out how those fit together. What they came up with sounds dated until you notice they’re describing modern heartbreak with uncomfortable accuracy.

The core insight: love can be ordered or disordered

The medieval framework, mostly Augustine’s, says love isn’t good or bad in itself. It’s good when it’s properly ordered, miserable when it isn’t. A few of their terms:

  • Caritas (charity) — divine love flowing through you toward others, seeking their good without self-interest. The highest form.
  • Amor Dei — love of God; the ultimate source and goal of every other love.
  • Amor Sui — proper self-love, the kind that makes loving others possible. (Christianity gets accused of teaching self-hatred; Augustine actively says the opposite — you have to love yourself rightly to love anyone else.)
  • Concupiscence vs. benevolence — selfish desire versus genuine care for someone else’s good.

Translation for non-religious readers: it doesn’t matter if “God” is your category. The structural insight survives without theology — what you place at the top of your love hierarchy shapes everything underneath it. If you make another person the ultimate source of meaning in your life, you will crush that relationship under the weight of what you need from it. This is what every therapist eventually tells someone in a co-dependent relationship, and Augustine described it in the 4th century.

Augustine’s three big ideas

Saint Augustine (354–430 CE) merged Plato with Christianity. Three of his moves still hold up:

Ordo amoris — the order of love

Love becomes virtuous when properly ordered. We should love God first, then others in appropriate measure. The point isn’t the ranking — it’s that loving a finite thing as if it were infinite is what destroys it. A relationship asked to be your sole source of meaning, your only safe place, your entire reason — that relationship breaks.

”My weight is my love”

Augustine wrote: “My weight is my love; wherever I am carried, my love is carrying me.” Love is the fundamental gravity of the soul. You don’t choose what moves you; you choose what to do about what moves you. This is the answer to the modern question “but I can’t help who I love” — Augustine agrees you often can’t, and then insists you can choose what to build on it.

Use versus enjoyment (uti vs. frui)

We use temporal things — including human relationships — as means toward ultimate goods. We enjoy only the ultimate Good as an end in itself. This sounds cold until you hear it as: don’t ask your partner to be God. Let them be a person.

Aquinas: love as rational appetite

Thomas Aquinas (1225–1274) built the most systematic medieval account, fusing Aristotle and Augustine. His three types map cleanly onto modern relationships:

  • Amor concupiscentiae — loving something for your own benefit. (Useful, not bad, but not the whole story.)
  • Amor benevolentiae — willing someone’s good for their sake, not yours.
  • Amor amicitiae — mutual benevolence with a shared life. This is the one Aquinas thought lasting partnership requires.

His phrase “love as rational appetite” sounds bizarre today. He meant: love is something you will, not something you only feel. Not because feeling doesn’t matter, but because lasting love involves a continued choice underneath the changing feelings.

Parallel traditions

Medieval Islamic and Jewish philosophers were doing similar work:

  • Ibn Sina (Avicenna) and Al-Ghazali in the Islamic tradition; the Sufi mystics treated love as a way of knowing — an epistemology, not just an emotion.
  • Maimonides in the Jewish tradition argued the highest love is intellectual love of God reached through philosophical contemplation.

These aren’t curiosities. They’re parallel attempts at the same problem, and they converge in interesting ways.

What medievals got right that we keep forgetting

Three things, all useful even if you’re entirely secular:

Disordered love makes you miserable. When you love a finite thing as if it were infinite — a partner, a child, a career, a parent — it bends under the weight. Most relationship pain is some version of this.

Self-love and other-love aren’t opposites. You can’t love someone else well if you can’t tolerate yourself. The medieval framework rejects both selfishness and self-destructive self-sacrifice.

Love is a choice underneath the feeling, not instead of it. Aquinas’s “rational appetite” is roughly what modern attachment researchers describe when they say committed love survives by continued small actions, not by chemistry.

The vocabulary is theological. The structure is psychological. It still works.