Charles Spurgeon Commentary Psalms 139:16

"Thine eyes did see mine unformed substance; And in thy book they were all written, [Even] the days that were ordained [for me], When as yet there was none of them." — Psalms 139:16 (ASV)

Which in continuance were fashioned, when as yet there was none of them.

God mapped out what he intended that we should be, even before we existed, and from our earliest days he cared for us.

If we look back upon our infancy—that significant period of life when we were utterly helpless and could do nothing at all for ourselves—it ought to check our unbelief.

For if God took charge of us then, and found means for our protection and growth when we were only little babies, then should we live to a second infancy, we may fairly trust that God will take care of us again.

And if we should ever, through sickness, be reduced to such a helpless state that we can do nothing for ourselves, yet he who cared for us before we saw the light, and when we saw it with feeble, trembling eyes, will still take care of us.

Thine eyes did see my substance, yet being unperfect; and in thy book all my members were written, which in continuance were fashioned, when as yet there was none of them.

God's wonderful foreknowledge enabled him to know us even before we knew ourselves, or anyone else knew us; and in the very making of us, the creation of our body and mind and spirit, God anticipated us.