The Fall of man is written in too legible characters not to be understood. Those that deny it, by their denying, prove it. The very heathens confessed and bewailed it. They could see the streams of corruption running through the whole race of mankind but could not trace them to the fountain-head. Before God gave a revelation of his Son, man was a riddle to himself. And Moses unfolds more in this one chapter (out of which the text is taken) than all mankind could have been capable of finding out of themselves, though they had studied to all eternity.
The Sermons of George Whitefield (Wheaton, IL; Crossway Books; 2012) Sermon #1: The Seed of the Woman and the Seed of the Serpent.