For thou hast possessed my reins: thou hast covered me in my mother's womb.
Ver. 13. For thou hast possessed my reins] The seat of mine affections. Thoughts kindle affections, and these cause thoughts to boil; they are causes one of another, and both well known to God. For who possesseth lands or houses, but he knoweth the right title and rooms thereof? saith an expositor.
Thou hast covered me in my mother's womb] But not from thine all-piercing eyes, though in so dark a place, and wrapt up in secundines .