"For this purpose the Son of God was manifested, that He might destroy the works of the devil." 1 John 3:8

At this day the world is still divided into children of God and children of the evil one. This distinction ought never to be forgotten; and yet thousands of sermons are preached in which it is quite ignored, and congregations are commonly addressed as if they were all the people of God. How shall we preach the truth if we begin by assuming a lie? Yet to assume that all our hearers are Christians is to begin with an error. Is it not highly probable that men will be built up in falsehood if the very truth which is addressed to them is put in a false way? No, my hearers, we cannot talk to you as all the people of God, for you are not; some of you are the children of the wicked one, and though it may not be pleasant to be told so, yet it is no business of ours to please you. Our duty is to preach so as to please God and benefit the souls of men, and that can only be effected by an honest enunciation of matters of fact. There is a definite and fixed line in the sight of God between the living and the dead, between those who are born again and those who abide in their fallen estate; between the spiritual and the carnal...

~ C.H. Spurgeon