6 If any one abide not in me, he shall be cast forth as a branch, and shall wither, and they shall gather him up, and cast him into the fire, and he burneth.
Chrysostom: If a man abide not in Me, he is cast forth as a branch, i.e. shall not benefit by the care of the husbandman, and withereth, i.e., shall lose all that it desires from the root, all that supports its life, and shall die.
Augustine: The branches of the vine are as contemptible, if they abide not in the vine, as they are glorious, if they abide. One of the two the branch must be in, either the vine, or the fire: if it is not in the vine, it will be in the fire.
7 If you abide in me, and my words abide in you, you shall ask whatever you will, and it shall be done unto you.
Chrysostom: He shows what it is to abide in Him. . . . It is to be shown by their works.
Augustine: Then may His words be said to abide in us, when we do what He has commanded, and love what He has promised. But when His words abide in the memory and are not found in the life, the branch is not accounted to be in the vine, because it derives no life from its root. So far as we abide in the Savior we cannot will any thing that is foreign to our salvation. We have one will, insofar as we are in Christ, another, insofar as we are in this world And by reason of our abode in this world, it sometimes happens that we ask for that which is not expedient, through ignorance. But never, if we abide in Christ, will He grant it us, Who does not grant except what is expedient for us. And here we are directed to the prayer, Our Father. Let us adhere to the words and the meaning of this prayer in our petitions, and whatever we ask will be done for us.
Scripture from the Douay-Rheims Bible. Commentary from St. Thomas Aquinas, Catena Aurea, Vol. I (London: Rivington, 1842).