What's an aggressive mental suggestion? The mental equivalent of a physical assault on our home and possessions? If it were that obvious, most of us would resist it manfully, and we wouldn't begrudge the time required to drive off the invader.
But aggressive mental suggestions often act more like corrosion—a process of disintegration hardly noticeable on a day-by-day basis. One of the worst forms of corrosion affecting boats is caused by electrical activity in salt water, which is a natural electrolyte. Propellers and rudders, hidden from view beneath the boat, have disintegrated under stress, their structural integrity having been destroyed by this influence. The alert mariner takes wise and regular steps to ward off this subtle enemy, which he knows is always attacking his boat.
Similarly, the alert Christian takes wise and regular steps to ward off the subtle corrosion of the carnal or mortal mind. It isn't sufficient merely to passively agree that the "old man" represented by mortal mind is a bad influence. It must be "put off," as Paul says,
See Eph. 4:20-24. and specific steps must be taken daily to reject its influence.
