Isaiah 54:1

Sing, O barren, thou [that] didst not bear; break forth into singing, and cry aloud, thou [that] didst not travail with child: for more [are] the children of the desolate than the children of the married wife, saith the LORD.

Ver. 1. Sing, O barren, thou that didst not bear.] O Church Christian, O Jerusalem that art above, the mother of us all, the purchase of Christ's passion, Isa 53:1-12 to whom thou hast been a bloody spouse, Act 20:28 an Aceldama or field of blood, 1Pe 1:18-19 he hath paid dear for thy fruitfulness. As the blood of beasts applied to the roots of trees maketh them sprout and bear more fruit, so doth the blood of Christ, sprinkled on the roots of men's hearts, make them more fruitful Christians, as it did the Gentiles whose hearts were purified by faith. Act 15:9 Gal 4:27 The grain of wheat that fell into the ground and died there, abode not alone, but brought forth much fruit. Joh 12:24

For more are the children of the desolate.] The Christian Church, made up of Jews and Gentiles, shall have a more numerous and glorious offspring than ever the synagogue had. Sarah shall have more issue than Hagar, Hannah than Peninnah.