Tertullian

“ Since, then, there equally are found the curse in the law and the blessing in faith, you have both conditions set forth by [38] the Creator: “Behold,” says He, “I have set before you a blessing and a curse.” [39] You cannot establish a diversity of authors because there happens to be one of things; for the diversity is itself proposed by one and the same author. Why, however, “Christ was made a curse for us,” [40] is declared by the apostle himself in a way which quite helps our side, as being the result of the Creator’s appointment. ”

“ What I say, then, is this, that that God is the object of faith who prefigured the grace of faith. But when he also adds, “For ye are all the children of faith,” [44] it becomes clear that what the heretic’s industry erased was the mention of Abraham’s name; for by faith the apostle declares us to be “children of Abraham,” [45] and after mentioning him he expressly called us “children of faith” also. But how are we children of faith? and of whose faith, if not Abraham’s? For since “Abraham believed God, and it was accounted to him for righteousness;” ”

“ For it would be more credible that that God had provided blessing for man, through the curse of Christ, who formerly set both a blessing and a curse before man, than that he had done so, who, according to you, [42] never at any time pronounced either. “We have received therefore, the promise of the Spirit,” as the apostle says, “through faith,” even that faith by which the just man lives, in accordance with the Creator’s purpose. ”