Institutes 1:12:11. True religion binds us to God as the one and only God
We said at the commencement of our work, (chap. 2,) that the knowledge of God consists not in frigid speculation, but carries worship along with it;and we touched by the way (chap. 5 s. 6, 9, 10) on what will be more copiously treated in other places, (Book 2, chap. 8,) viz., how God is duly worshipped. Now I only briefly repeat, that whenever Scripture asserts the unity of God, it does not contend for a mere name, but also enjoins that nothing which belongs to Divinity be applied to any other; thus making it obvious in what respect pure religion differs from superstition.