[Our flesh] indicates that the essential way in which people are rebelling against God is that they are assuming that, like Him, they can make the decisions necessary for enjoying a fulfilled and happy future. The folly of this rebellion is that people think that they love themselves more, are wiser, and thus better able than the all-loving, omniscient, omnipotent God to provide for themselves the fulfillment they crave. Thus conversion, according to Jesus, reverses the act of the Fall and makes a declaration, not of independence from God, but dependence on Him.
Daniel Fuller