Living in the Flesh by the Spirit

What does Paul mean by "e;the flesh"e;? There is a great deal of confusion among laymen and disagreement among scholars on this issue. Christians know that we are supposed to "e;walk by the Spirit"e; so that they will not gratify the desires of the flesh, but it is not entirely clear what these expressions mean. Furthermore, Paul can also be confusing when he addresses the Christian's relationship...