Paul compares two ways of entering heaven. One way is to rely on your own righteousness, banking on your own good works to earn your way to salvation. Paul declares that if there ever was one who could put confidence in the flesh it was him, but after knowing Christ, he counts all his works of the flesh to be worth less than excrement. Instead, he embraces the other way, the only way, to salvation which is to rely entirely upon the work of Jesus on the cross to pay for his sins.
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