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Isaiah calls the Church barren because her children are born without effort by the Word of faith through the Spirit of God. It is a matter of birth, not of exertion.

Martin Luther (2007). “Commentary on Galatians”, p.101, Lulu.com
Isaiah calls the Church barren because her children are born without effort by the Word of faith through the Spirit of God. It is a matter of birth, not of exertion.