John 8:35 - Matthew Poole's English Annotations on the Holy Bible

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.