  In the introduction of the second part of the Guide of the Perplexed, Maimonides summarizes twenty-five premises of Aristotelian science (and one more that Maimonides attributes to the philosopher: the eternity of the world). In the first chapter of the second part, Maimonides gives philosophical (i.e., [neo-]Aristotelian) proofs of the three principal beliefs relating to God: his existence; his unity, and his immateriality. In the first part of the first essay, Crescas explains these twenty-six premises and the six proofs offered by Maimonides on behalf of the Aristotelians. In the second part of this essay, Crescas critiques fourteen of the premises of Aristotelian science. Afterwards he argues against Maimonides’ six proofs of the existence of God, his unity, and his immateriality.