For it is written that Abraham had two sons, one by the ¹  slave woman and the other by the free woman.

Christ redeemed us from the curse of the law by becoming ¹  a curse for us (because it is written, “Cursed is everyone who hangs on a tree”) ² 

For all who ¹  rely on doing the works of the law are under a curse, because it is written, “Cursed is everyone who does not keep on doing everything written in the book of the law.” ² 

For it is written: “Rejoice, O barren woman who does not bear children; ¹  break forth and shout, you who have no birth pains, because the children of the desolate woman are more numerous than those of the woman who has a husband.” ²