For it is written, Rejoice, thou barren that bearest not; break forth and cry, thou that travailest not: for the desolate hath many more children than she which hath an husband.
27. For it is written. The apostle proves, by a quotation from Isaiah, that the lawful sons of the Church are born according to the promise. The passage is in Isaiah 54 where the prophet speaks of the kingdom of Christ and the calling of the Gentiles, and promises to the barren wife and the widow a numerous offspring; for it is on this ground...
In these verses the apostle illustrates the difference between believers who rested in Christ only and those judaizers who trusted in the law, by a comparison taken from the story of Isaac and Ishmael. This he introduces in such a manner as was proper to strike and impress their minds, and to convince them of their great weakness in departing from the truth, and suffering...
Commenting on Galatians 4:21-31
Now we, brethren, as Isaac was,.... The Ethiopic version reads, "you, brethren"; and so one of Stephens's copies. As the two women, Hagar and Sarah, might be, and are allegorized; so likewise their respective offspring. Isaac signified, and was a type and figure of Abraham's spiritual seed, whether Jews or Gentiles, under the Gospel dispensation: and as he was, so they are, the children of...