God uses the sun, but needs it not

No creature has a force more wondrous or glorious than that of the sun. For besides lighting the whole earth with its brightness, how great a thing is it that by its heat it nourishes and quickens all living things! That with its rays it breathes fruitfulness into the earth! That it warms the seeds in the bosom of the earth, draws them forth with budding greenness, increases and strengthens them, nourishes them anew, until they rise up into stalks! That it feeds the plant with continual warmth, until it grows into a flower, and from flower into fruit! That then, also, with baking heat it brings the fruit to maturity! Yet the Lord, to claim the full credit for all these things, willed that, before he created the sun, light should come to be and earth be filled with all manner of herbs and fruits [Gen. 1:3, 11, 14]. Therefore a godly man will not make the sun a principal or necessary cause of these things which existed before the creation of the sun, but merely the instrument that God uses because he so wills; for with no more difficulty he might abandon it, and act through himself. John Calvin, Institutes 1.16.2