At the Calvinist International I’ve published another in my series of posts in which I translate portions from J.H. Alsted’s Theologia naturalis. Here’s an excerpt from Alsted on how the light of reason relates to the light of faith:
Pious men explain this by means of an apposite similitude: They say, just as the sunlight does not put out the [light] of the stars but makes their lesser light yield to a more abundant light, so the light of Grace does not put out the light of Nature but makes it yield. And again, just as the stars yield to the Sun so that they do not fall from the sky, so reason yields to faith so that it does not fall from the sky of the microcosm. Let [faith] cease, if you will, and [reason] falls. The little torch of reason acknowledges its inferiority to grace coming forth from the celestial chamber as to the Sun, the superior of the stars. But, [the soul] does not cast away a power innate to it with the arrival of [grace], any less than the stars do not cast away their own power of shinning with the arrival of noon.