when he hath taken away - that is, subdued “the multitude” of Antiochus.
heart ... lifted up - instead of following up his victory by making himself master of the whole of Syria, as he might, he made peace with Antiochus, and gave himself up to licentiousness [Polybius, 87; Justin, 30.4], and profaned the temple of God by entering the holy place [Grotius].
not be strengthened by it - He shall lose the power gained by his victory through his luxurious indolence.