Isaiah 65:18 - Matthew Poole's English Annotations on the Holy Bible

You that are my people, though you cannot rejoice with that degree of joy that attendeth a present fruition of good; yet be glad, and rejoice with the rejoicing of hope, for the thing is certain what I am already doing. Nor let your present state, or the discouragements you have from seeming improbabilities, spoil your joy; for it is not a work to be produced in an ordinary course, or by an ordinary power, but by the power of me, who bring something out of nothing, or out of what hath no fittedness to such a production; and I will create Jerusalem a rejoicing, and her people a joy: by Jerusalem here must be meant the church, as well under the gospel as under the law (because the gospel church is grafted into that olive); or else this prophecy must be understood as fulfilled in the coming of Christ, Luke 2:10; or else it referreth to a more full calling of the Jews than we have yet seen or heard of.