John the Apostle
John 8:31ESV·traditional attribution

So Jesus said to the Jews who had believed him, “If you abide in my word, you are truly my disciples,

John Calvin Reformed @genevareformer

31. If you continue in my word. Here Christ warns them, in the first place, that it is not enough for any one to have begun well, if their progress to the end do not correspond to it; and for this reason he exhorts to perseverance in the faith those who have tasted of his doctrine.

Matthew Henry Presbyterian @wholebiblehenry

We have in these verses, I. A comfortable doctrine laid down concerning the spiritual liberty of Christ's disciples, intended for the encouragement of those Jews that believed. Christ, knowing that his doctrine began to work upon some of his hearers, and perceiving that virtue had gone out of him, turned his discourse from the proud Pharisees, and addressed himself to those weak believers.

Commenting on John 8:31-37

John Gill Reformed Baptist @doctorgill

Jesus answered them, verily verily I say unto you,.... Taking no notice of their civil liberty, to which he could easily have replied to their confusion and silence, he observes to them their moral servitude and bondage, and in the strongest manner affirms, that whosoever committeth sin, is the servant of sin; which must be understood, not of one that commits a single act of...