John 8:35

The servant of sin abideth not in the church (which is the house of God) for ever. Look as it is with slaves, and servants; they are no fixed members of families; they may be turned out, they may be sold over to others; they abide in families according as in them they behave themselves: so you, who, as you are Abraham's seed, as you boast and glory, are now servants in the church of God; yet if you continue to be servants of sin, you shall not for ever abide in God's house; if you be not cast out of the church militant, you shall certainly be cast out of the church triumphant; that is, you shall never come there. But the Son; some think he speaks of himself who was the eternal Son of God, he abideth ever; but I rather think he speaks of him that is a son by adoption, 1 Thessalonians 1:12 Romans 8:15,16. So as this text showeth us the remarkable difference betwixt a nominal professor, and one who is a true believer: the one is but as a servant in God's house, to whom belongeth no inheritance; though while he is in the family, he enjoys some common privileges which a mere stranger hath no right to: the other is a son, and hath a right to the inheritance, and so shall never be cast out of the family, but abideth in it for ever.