Polanus and Required Revelation
In the prolegomenon to his dogmatics Polanus argues that the natural limitation of reason would have made revelation necessary for full knowledge of God. But the fall has rendered man's reason vitiated and corrupt: both grace and revelation are now necessary.
Richard Muller, "Duplex cognitio dei" in the Theology of Early Reformed Orthodoxy, Sixteenth Century Journal X, 2 (1979). 57