John Calvin

I answer, both to disciples and to teachers, God is made known to be the author of it by the revelation of the same Spirit. Moses and the prophets did not utter at random what we have received from their hand, but, speaking at the suggestion of God, they boldly and fearlessly testified, what was actually true, that it was the mouth of the Lord that spake. The same Spirit, therefore, who made Moses and the prophets certain of their calling, now also testifies to our hearts, that he has employed them as his servants to instruct us. Accordingly, we need not wonder if there are many who doubt as to the Author of the Scripture; for, although the majesty of God is displayed in it, yet none but those who have been enlightened by the Holy Spirit have eyes to perceive what ought, indeed, to have been visible to all, and yet is visible to the elect alone. This is the first clause, that we owe to the Scripture the same reverence which we owe to God; because it has proceeded from him alone, and has nothing belonging to man mixed with it. John Calvin on 2 Timothy 3:16