John Chrysostom
Catena Aurea · Johannesevangelium 15
Abide in me, and I in you. As the branch cannot bear fruit of itself, except it abide in the vine; no more can ye, except ye abide in me. I am the vine, ye are the branches: He that abideth in me, and I in him, the same bringeth forth much fruit: for without me ye can do nothing. If a man abide not in me, he is cast forth as a branch, and is withered; and men gather them, and cast them into the fire, and they are burned. If ye abide in me, and my words abide in you, ye shall ask what ye will, and it shall be done unto you.
(Hom. lxxvi. 1) The Son then contributes no less than the Father to the help of the disciples. The Father changeth, but the Son keepeth them in Him, which is that which makes the branches fruitful. And again, the cleansing is attributed to the Son also, and the abiding in the root to the Father who begat the root. (c. 2.). It is a great loss to be able to do nothing, but He goes on to say more than this: 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.