The Five Ways are five arguments for the existence of God set out by the thirteenth-century philosopher and theologian Thomas Aquinas in his Summa Theologica. The first three are versions of the cosmological argument: the argument from motion, holding that anything in motion must be moved by something else, tracing this chain back to an unmoved first mover; the argument from efficient cause, holding that a chain of causes cannot regress infinitely and so must have a first uncaused cause; and the argument from contingency, holding that things which merely could exist or not exist depend for their existence on something that exists necessarily. The fourth way argues from observed degrees of qualities such as goodness and truth to the existence of a maximally perfect being as the standard by which lesser degrees are measured, and the fifth, a version of the teleological argument, reasons from the apparent purposive behavior of non-intelligent things in nature to the existence of an intelligent being that directs them toward their ends. Aquinas presented the Five Ways as demonstrations reasoning from observable effects in the world back to their ultimate cause, while holding that God's own essential nature remains beyond what such arguments alone can establish.
Facts
Origin YearSourced to the subject's own accountThe cited source dates Aquinas only to the 13th century; 1265 marks the conventional start of the Summa Theologicas composition. Classification
Position Kind FAQs
Why are only the first three of Aquinas's Five Ways usually called versions of the cosmological argument?
The first three ways trace a causal chain in the physical world (motion, efficient cause, contingency) back to a first uncaused cause, while the fourth reasons from degrees of goodness and truth to a most perfect being, and the fifth is a version of the teleological argument from apparent purpose in nature, so only the first three share the cosmological argument's causal-chain structure.
Aquinas's Five Ways are five separate arguments for the existence of God set out in the Summa Theologica. The first three, the argument from motion, the argument from efficient cause, and the argument from contingency, all reason from a causal chain observed in the physical world back to a first term that cannot itself be caused, which is the defining structure of the cosmological argument. The fourth way instead reasons from the observed gradation of qualities such as goodness and truth to the existence of a maximally perfect being that serves as the standard by which lesser degrees are measured, a different kind of inference from a causal regress. The fifth way is itself a version of the teleological argument, reasoning from the apparent purposive behavior of non-intelligent things in nature to an intelligent being that directs them. Aquinas presented all five as demonstrations reasoning from observable effects back to their ultimate cause, while holding that God's own essential nature remains beyond what such arguments alone can establish.
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Source Five Ways (Aquinas) (Wikipedia)
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Source Five Ways (Aquinas) (Wikipedia)
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1. Five Ways (Aquinas) (Wikipedia)
LeadQuote, Lead
The Quinque viæ (Latin for "Five Ways") (sometimes called the "five proofs") are five logical arguments for the existence of God summarized by the 13th-century Catholic philosopher and theologian Thomas Aquinas in his book Summa
2. Quinque viae (Wikipedia)
WikipediaQuinque viae (Wikipedia), on Aquinas and the Summa Theologica
summarized by the 13th-century Catholic philosopher and theologian Thomas Aquinas in his book Summa Theologica.
Quinque viae (Wikipedia), introduction
The Quinque viae (Latin for Five Ways) (sometimes called the five proofs) are five logical arguments for the existence of God summarized by the 13th-century Catholic philosopher and theologian Thomas Aquinas in his book Summa Theologica.
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