Every single aspect of this world has been infected and affected by sin. Paul goes to great detail, in this first portion of his letter, to make it known that we are all guilty before God. Therefore, we are all in desperate need of divine intervention in our lives. In this next section of Scripture (vs.13-20) Paul takes a look at the conduct on the natural man. He starts with an emphasis on human speech, and he paints a disgusting picture, proceeding from throat to tongue to lips to mouth. Just as the words of the natural man are deceitful, the actions of the natural man are destructive.