Charles H. Spurgeon on Psalms 139:15

My substance was not hid from thee. Should an artisan intend commencing a work in some dark cave where there was no light to assist him, how would he set his hand to it? in what way would he proceed? and what kind of workmanship would it prove? But God makes the most perfect work of all in the dark, for he fashions man in the mother's womb. —John Calvin.