This depravation of our affections by the fall, is the only corruption of our nature that is evident to reason, or to the light of nature itself. The wise among the heathen both saw it, and complained of it. They found a weakness in the mind, but saw nothing of its darkness and depravation as to things spiritual. But they were sensible enough of this disorder and tumult of the affections in things moral, which renders the minds of men "like the troubled sea, whose waters cast up mire and dirt." Isa 57.20 This greatly aggravates the neglect of those who aren't sensible of it in themselves, because it is discernible in the light of nature.