The central message of this sermon is that false teachers will arise, but believers should not worry about them because God will judge them and preserve us. The main point is to be aware of these false teachers, recognize their characteristics, and avoid following them. The sermon advances the belief that God is sovereign and in control, and that He will always prevail over evil. The takeaway the teacher wants listeners to understand is not to be paranoid or fearful, but rather to be alert and watchful for the signs of false teaching, and to trust in God's judgment and preservation.