John 15:5

ἐγὼ … κλήματα “I am the Vine, ye are the branches,” together forming one tree and possessed by one common life. The stock does not bear fruit, but only the branches; the branches cannot live without the stock. Therefore it follows ὁ μένων … οὐδέν. The one thing needful for fruit-bearing is that we abide in Christ, and He in us; that the branch adhere to the vine, and the life of the vine flow into the branch. χωρὶς ἐμοῦ, “in separation from me”. See Ephesians 2:12. Grotius gives the equivalents “seorsim,” “separatim,” κατὰ μονάς, κατʼ αὐτό. οὐ δύνασθε ποιεῖν οὐδέν, “ye cannot do anything,” absolutely nothing according to John 1:3-4; but here the meaning is, “ye cannot do anything which is glorifying to God, anything which can be called fruit-bearing,” John 15:8.