i looked up the reference to Aquinas, even he did not think that knowlege of God could be gained by reason alone. As mentioned by Sproul, et al, Such a view is called naturalism and it is universally rejected by historical Christianity.
Augustine did a treatus on the role of reason, that Aquinas modified, that teaches that once reason determines that a specific revelation is from God, that reason must submit to that revelation (i.e., scripture).
Gerstner, in his book on Jonathan Edwards, lists Edwards' teaching on the role of reason, and it is probably clearer, but we would be drifting far off the topic of the thread, and as a result i hesitate on that.
I suppose that Calvin would say that reason CANNOT submit to the Revelation unless it is sealed by the Spirit.
From the article:
But I answer,that the testimony of the Spirit is superior to reason. For as God alone can properly bear witness to his own words, so these words will not obtain full credit in the hearts of men, until they are sealed by the inward testimony of the Spirit.
So unless one is sealed by the Spirit, then Reason will not avail them.
Gerstner, in his book on Jonathan Edwards, lists Edwards' teaching on the role of reason, and it is probably clearer, but we would be drifting far off the topic of the thread, and as a result i hesitate on that.
I don't think it would be that far-off topic since Calvin here is addressing Reason and Revelation. So be my guest and post it if you want.