15:2 Son of man, What is the vine tree more than any tree, [or than] a branch which is among the {a} trees of the forest?
(a) Which brings forth no fruit, no more than the other trees of the forest do: meaning that if Jerusalem, which bore the name of his Church, did not bring forth fruit it would be utterly destroyed.
15:2 The vine - tree - Israel is here compared to a vine, which, when fruitless, is utterly unprofitable. This the prophet minds them of to humble them, and awaken them to fruitfulness. A branch - One branch of a tree in the forest is of more use than the whole vine - tree is, except for its fruit.
15:1-8 Jerusalem like an unfruitful vine. - If a vine be fruitful, it is valuable. But if not fruitful, it is worthless and useless, it is cast into the fire. Thus man is capable of yielding a precious fruit, in living to God; this is the sole end of his existence; and if he fails in this, he is of no use but to be destroyed. What blindness then attaches to those who live in the total neglect of God and of true religion! This similitude is applied to Jerusalem. Let us beware of an unfruitful profession. Let us come to Christ, and seek to abide in him, and to have his words abide in us.