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Aquinas gave the first-cause argument and the argument from contingency—both forms of cosmological reasoning—a central place for many centuries in the Christian enterprise of natural theology. (Similar arguments also appeared in parallel strands of Islamic philosophy.) Thomas’s formulations (Summa theologiae, I, Q. 2, art. 3) were refined in modern neo-Thomist discussions and remained topics of Christian philosophical reflection during the 20th century. The first-cause argument begins with the assumption that there is change in the world. Change is always the effect of some cause or causes. Each cause is itself the effect of a further cause or set of causes; ...(100 of 123600 words)