15 Drink water from your own cistern,
running water from your own well.
Here we turn from a lengthy warning of the perils of adultery to a lesson in the importance of sexual fidelity. The cistern was perhaps the most precious possession of the ancient home, sustaining the life thereof, and it this to which the marital union is compared. The cautions against promiscuity are not commands to remain thirsty, but reminders of the risks and complications of contaminated waters. No satisfying substitute for marital intimacy exists, try as we might to quench our thirst elsewhere.