Coram Deo is the theological shorthand for the truth that every moment of every life is lived in the immediate presence of God. Nothing is hidden from Him, nothing is outside His notice, and every word, thought, and action is offered up whether we intend it or not. "All things are naked and open to the eyes of Him to whom we must give account" (Hebrews 4:13). The practical implication is that there is no such thing as a "secular" sphere. When you are at work, you are coram Deo. When you are alone with your phone, you are coram Deo. When you are reviewing your finances, disciplining your children, choosing what to watch, you are coram Deo. The Reformers recovered this doctrine against the medieval dichotomy between "sacred" and "secular" callings, insisting that a cobbler glorifies God at the bench as truly as a priest does at the altar. The call of coram Deo is not a call to anxiety but to integrity — to live one life, visible all the way through, under the eye of the One who made you.
Hebrews 4:13 — "And there is no creature hidden from His sight, but all things are naked and open to the eyes of Him to whom we must give account."
Psalm 139:7-8 — "Where can I go from Your Spirit? Or where can I flee from Your presence? If I ascend into heaven, You are there; if I make my bed in hell, behold, You are there."
Proverbs 15:3 — "The eyes of the LORD are in every place, keeping watch on the evil and the good."
Colossians 3:23 — "And whatever you do, do it heartily, as to the Lord and not to men."