Astrology and Free WillA Christian View
The stars may move the body and its moods; they cannot move the will. That is the Christian answer from Augustine to Aquinas.
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"The stars incline, they do not compel"
The Latin saying astra inclinant, non necessitant sums up the Christian position of the Middle Ages: the heavens may move the body and its moods, but they cannot force the will. It is often credited to Thomas Aquinas, whose teaching it condenses.
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What Aquinas taught
In the Summa Theologiae (I, q. 115, a. 4) Aquinas grants that the heavenly bodies act on bodies, and so on the passions that live in the body, but not directly on the intellect and will. Because most people follow their passions, astrologers can often foretell what most people will do; they cannot foretell what a free person must choose.
What Augustine saw in the twins
Augustine's answer was older and sharper: twins born in the same hour, like Esau and Jacob, lead different lives, and a slave's child can be born at the moment of a rich man's son (City of God, book V; Confessions VII.6). If the hour decided the life, those lives would match.
What it means for a chart
Most astrologers today say the same in their own words: a chart describes tendencies and timing, not fixed outcomes. The Christian reading adds the reason: the will belongs to the person, and the person belongs to God.
Reading it with discernment
The test offered here is the fruit: whether a question about the heavens or the unseen leads toward humility, prayer and love of neighbor, or toward fear, secrecy and control. God first, and every created sign after him.
Practical boundaries
Authority
God, Scripture, conscience, wise counsel, and love of neighbor stand above every reading.
Fruit
A practice should be judged by what it forms: humility or pride, peace or fear, responsibility or avoidance.
Limits
The hidden world is not a playground for control. Curiosity stays accountable and prayerful.
Discernment checklist
- Does this interpretation increase humility instead of pride or fear?
- Does it preserve responsibility instead of blaming the sky?
- Does it lead toward prayer, repair, patience, courage, and love of neighbor?
- Would a wise friend recognize the fruit as good?
Make it personal
Open a faith-aware personal reflection: reflective guidance drawn from your own chart, with no claim to predict what only God knows.
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Sources and editorial method
Research and editorial references used for this page include:
- Thomas Aquinas, Summa Theologiae I, q. 115, a. 4 (New Advent) - Whether the heavenly bodies are the cause of human acts.
- BibleGateway: Genesis 25:24-27 (KJV) - Quoted on this page in the King James Version.
Scripture is quoted from the King James Version; the church fathers and the Catechism are cited by book and paragraph.
From the reference page to your own chart
Every word here
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Common questions
Do the stars control our lives?
Christian teaching says no: the heavens may influence the body and its moods, but the will stays free (Thomas Aquinas, Summa Theologiae I, q. 115, a. 4).
Who said "the stars incline, they do not compel"?
The Latin saying astra inclinant, non necessitant is medieval and is often credited to Thomas Aquinas, whose teaching it condenses.
What did Augustine say about fate and the stars?
That twins born together, like Esau and Jacob, live different lives, so the hour of birth cannot decide a life (City of God, book V).
Continue in Christian Foundations & Created Order
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