Question 1 · AO1 Knowledge and Understanding Essay Part (a)
25 marks'Whatever is in motion is put in motion by another.' Give an account of Aquinas's cosmological argument for the existence of God, as presented in his 'Five Ways'.
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Worked solution
The cosmological argument is an a posteriori argument for God's existence (based on observation of the world), most famously developed by Thomas Aquinas in the 'Five Ways' (Quinque Viae) of his Summa Theologica.
The First Way, the argument from motion (or change), begins from the observed fact that things in the world are in motion or change (Aquinas uses 'motion' broadly, to mean change from potentiality to actuality). He argues that whatever is in motion must be put in motion by something else, since nothing can move itself from potentiality to actuality except by something already actual. This gives a chain of movers, each moved by a prior mover. Aquinas argues this chain cannot regress infinitely, because without a first mover there would be no subsequent movers, and so no motion at all — yet motion evidently exists. Therefore, he concludes, there must be a First Mover, itself unmoved by anything else, 'and this everyone understands to be God.'
The Second Way, the argument from causation, follows a similar structure: nothing can be the efficient cause of itself, since this would require it to exist prior to itself, which is impossible. We observe an order of efficient causes in the world; this series cannot regress infinitely, since removing the first cause removes all the causes and effects that depend on it. Therefore there must be a First (Uncaused) Cause, which Aquinas identifies with God.
A fuller account might also outline the Third Way, the argument from contingency: things in the world are contingent (they could exist or not exist, and at some time did not exist); if everything were merely contingent, at some point nothing would have existed; but if nothing had existed, nothing could begin to exist now, since something cannot come from nothing; yet things clearly do exist now; therefore a necessary being must exist, whose existence does not depend on anything else — God.
Key features: the argument rejects an infinite regress of movers/causes; it reasons from empirical premises (motion, causation, contingency exist) to a metaphysical conclusion (a First Mover/Cause/Necessary Being); Aquinas identifies this being with the God of classical theism.
The First Way, the argument from motion (or change), begins from the observed fact that things in the world are in motion or change (Aquinas uses 'motion' broadly, to mean change from potentiality to actuality). He argues that whatever is in motion must be put in motion by something else, since nothing can move itself from potentiality to actuality except by something already actual. This gives a chain of movers, each moved by a prior mover. Aquinas argues this chain cannot regress infinitely, because without a first mover there would be no subsequent movers, and so no motion at all — yet motion evidently exists. Therefore, he concludes, there must be a First Mover, itself unmoved by anything else, 'and this everyone understands to be God.'
The Second Way, the argument from causation, follows a similar structure: nothing can be the efficient cause of itself, since this would require it to exist prior to itself, which is impossible. We observe an order of efficient causes in the world; this series cannot regress infinitely, since removing the first cause removes all the causes and effects that depend on it. Therefore there must be a First (Uncaused) Cause, which Aquinas identifies with God.
A fuller account might also outline the Third Way, the argument from contingency: things in the world are contingent (they could exist or not exist, and at some time did not exist); if everything were merely contingent, at some point nothing would have existed; but if nothing had existed, nothing could begin to exist now, since something cannot come from nothing; yet things clearly do exist now; therefore a necessary being must exist, whose existence does not depend on anything else — God.
Key features: the argument rejects an infinite regress of movers/causes; it reasons from empirical premises (motion, causation, contingency exist) to a metaphysical conclusion (a First Mover/Cause/Necessary Being); Aquinas identifies this being with the God of classical theism.
Marking scheme
Level of response marking (25 marks, AO1). Band 5 (21–25): a detailed, accurate and well-structured account of Aquinas's cosmological argument, correctly explaining the First Way (motion) and/or Second Way (causation), with accurate technical vocabulary (potentiality/actuality, efficient cause, infinite regress, contingency/necessity), showing sophisticated understanding of the argument's logical structure and conclusion; may include the Third Way for added depth. Band 4 (16–20): a mostly accurate, well-organised account covering the key stages of at least one of Aquinas's arguments in reasonable depth, with generally correct terminology; minor inaccuracies/omissions possible. Band 3 (11–15): a reasonable, generally accurate outline showing understanding of the basic structure (rejection of infinite regress, conclusion of a first cause/mover), but lacking depth or full technical precision, or only partially engaging with Aquinas specifically. Band 2 (6–10): a limited account, with some accurate but underdeveloped points; partial or confused understanding of the argument's structure. Band 1 (0–5): very limited, largely inaccurate, or irrelevant material. Answers may include: the First Way (motion), Second Way (causation), Third Way (contingency), rejection of infinite regress, potentiality/actuality, the conclusion identified with God. Accept valid alternatives. Mark in levels.