"The scriptural revelation takes epistemological priority over general revelation, not because general revelation is obscure or because man as sinner cannot know it, but because Scripture as an inspired literary document republishes the content of general revelation objectively, over against sinful man's reductive dilutions and misconstructions of it." Ibid. at p. 223.
Turretinfan than goes on to offer two passages from the letters of St. Paul:
What is general revelation? It is the revelation discussed here:
18For the wrath of God is revealed from heaven against all ungodliness and unrighteousness of men, who hold the truth in unrighteousness; 19Because that which may be known of God is manifest in them; for God hath shewed it unto them. 20For the invisible things of him from the creation of the world are clearly seen, being understood by the things that are made, even his eternal power and Godhead; so that they are without excuse: 21Because that, when they knew God, they glorified him not as God, neither were thankful; but became vain in their imaginations, and their foolish heart was darkened. 22Professing themselves to be wise, they became fools, 23And changed the glory of the uncorruptible God into an image made like to corruptible man, and to birds, and fourfooted beasts, and creeping things.
This is in stark contrast to special revelation, which is the kind of revelation discussed here:
1 God, who at sundry times and in divers manners spake in time past unto the fathers by the prophets, 2Hath in these last days spoken unto us by his Son, whom he hath appointed heir of all things, by whom also he made the worlds; 3Who being the brightness of his glory, and the express image of his person, and upholding all things by the word of his power, when he had by himself purged our sins, sat down on the right hand of the Majesty on high; 4Being made so much better than the angels, as he hath by inheritance obtained a more excellent name than they.
Does anyone else find it ironic that the proof texts for the notion that Scriptural Revelation has priority over general revelation that Turretinfan, a Protestant who follows the dictates of John Calvin, offers the reader are two passages where St. Paul is quoting from the Deuterocanonical book of Wisdom of Solomon (Rom. 1:18-23=Wisdom 13:1-9; Hebrews 1:1-4=Wisdom 7:26)?