Paul is urging these friends to live _no longer_ as they, in common with all the races, had been living, in "the vanity of their mind, being darkened in their understanding, alienated from the life of God, because of the ignorance that is in them, because of the hardening of their hearts; who, being past feeling, gave themselves up to lasciviousness to make a greedy trade of all uncleanness." Here are seven steps down. The first five are put in reverse order. Beginning where they have been, he traces the five steps back to the starting point, and then adds the two likely to follow with any who persist past this point. The start of all sin is in the setting of one's self against God. Choosing some other way than His. It is called here "hardening of the heart." The native juices of the heart are drawn away from God and dry up. In this Book the heart is the seat of both affection and will. It is the pivotal organ of life. Any trouble there quickly and surely affects the whole being. Then follows "ignorance." Of course. The heart controls both ear and eye, the two great channels inward of knowledge. The hardening of the heart locks both doors. And hard on the heels of that comes "_Alienated_ from the life of God." That is, _cut off,_ shut out of fellowship and intimacy. Life is _union with God_. Through union God's life flows into us. Union is rooted in knowledge _and_ in sympathy, fellow-feeling, a common desire and purpose. The man snapping that tying cord cuts himself off. The next step is peculiarly pathetic--"darkened in their understanding." The man has shut the shutters close, and pulled the shades down tight. Of course it's dark inside. He is unable to see. First unwilling, now unable. If the only thing that can be gotten for use as light be _darkness_, how intense is that darkness! Then comes the pitiable result of acting as if darkness were man's native air--"the vanity of the mind." That word vanity means aimlessness. The mind is still keen, even brilliant, but the guiding star is shut out, and that keen mind goes whirring aimlessly around. Sometimes a very earnest aimlessness. The man's on a foggy sea without sun or star. The compass on board is useless. But more pitiable and pathetic yet; indeed utterly laughable if it were not so terribly serious and pathetic:--this man in the dark proceeds gravely to decide that this darkness of his own making is a superior sort of light, and bows low in worship of its maker. He has even been known to write brilliant essays on the light-giving power of blinding darkness, with earnest protests at the evil of this thing commonly called light. Sometimes having carefully cottoned up the shutters that no scrap of sun light or sun warmth may get in, he strikes a friction match, and sits warming himself, and eloquently sets forth his own greatness as shown by the match, _friction_ match. Most of this sort of light and heat is of the friction sort.