Of the nations concerning which the LORD said unto the children of Israel,
You shall not go in to them, neither shall they come in unto you: for surely they will turn away your heart after their gods:
Solomon clung unto these in love.
Read Chapter 11
Augustine of Hippo
[God] promised that something everlasting would spring from David’s seed. Then Solomon was born, and he became a man of such profound wisdom that everyone supposed God’s promise concerning David’s offspring had been fulfilled in him. But no, Solomon fell and so made room for people to stretch their hope toward Christ. God can neither be deceived nor deceive us, so we can be certain that he did not ground his promise in Solomon, for he knew Solomon would fall. The divine purpose was that after Solomon’s fall you would look to God and earnestly press him for what he had promised.
Did you lie, then, Lord? Do you go back on your promises? Do you fail to deliver what you swore to give? Perhaps God will counter you by saying, “I did swear, and I did promise, but that man did not persevere.” But how can that be the answer? Did you not foresee, O Lord God, that he would not persevere? Of course you foresaw it. Why, then, did you promise me something that would last forever and attach that prom...
However, in [David’s] son Solomon libido was not a passing guest; it reigned as a king. Scripture does not pass this over in silence but blames him as a lover of women. His beginnings were redolent with the desire for wisdom; when he had obtained it through spiritual love, he lost it through carnal love. - "Christian Instruction 3.21.31"
In the previous chapters the Scripture related the marriage of Solomon with the daughter of Pharaoh and did not rebuke him because she was the one wife only who did not secretly practice the religion of her homeland and was no reason of offense for him. But later he took other wives, so that the holy Scripture justly condemned both the previous marriage and these new ones. And there were four reasons for this: the first was his open transgression against religion because he had brought back [Israel’s] ancient idolatry which he had previously rejected; the second was that he took many wives against the clear precept of the Law; the third was that he loved these wives to distraction; the fourth was his apostasy from the worship of the true God which derived, as the Law had predicted, from such marriages. Therefore, with good reason the Scripture emphasizes many times, with very severe words, that the crime of Solomon was a consequence of his familiarity with these women. A further detail...
Gods. See Exodus xxxiv. 16., and Deuteronomy vii. 4. The law only forbids expressly the marrying of the women of Chanaan. But it was easy to discern, that the spirit of the law equally prohibited connexions with others who were addicted to idol-worship. See 1 Esdras x. 3. Such alliances are always dangerous, and generally prove fatal; (Calmet) unless there be good reason to believe that the parties are sincerely converted: in which case the prohibition ceases. (Haydock)
Love. Thus, nitimur in vetitum semper, cupimusque negata; and, stolen waters are sweeter, says impure love; but her guests are in the depths of hell, Proverbs ix. 17, 18.