Then said Jesus to those Jews who believed on him,
If you continue in my word, then are you my disciples indeed;
All Commentaries on John 8:31 Go To John 8
George Leo Haydock
AD 1849
If you persevere in the true faith, and in the observance of my words, you shall be my disciples indeed. It is not sufficient to believe; you must likewise do what my words command you to do: nor will it be sufficient to have the true faith for a time; you must persevere in that faith to the end. (St. Augustine, Ven. Bede, St. Chrysostom, Theophylactus, Euthymius)
Faith alone without perseverance, or abiding in God's commandments, will not suffice. (Bristow)