Commentaries:
Jamieson, Fausset, and Brown
wife . . . youth—married in youth.
By figures, in which well, cistern, and fountain [Proverbs 5:15, Proverbs 5:18] represent the wife, and rivers of waters [Proverbs 5:16] the children, men are exhorted to constancy and satisfaction in lawful conjugal enjoyments. In Proverbs 5:16, fountains (in the plural) rather denote the produce or waters of a spring, literally, "what is from a spring," and corresponds with "rivers of waters."
Other Jamieson, Fausset, and Brown entries containing Proverbs 5:18:
Proverbs 5:15-20
Ecclesiastes 9:9
Malachi 2:14
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