For Hagar is mount Sinai in Arabia, and corresponds to Jerusalem which is now, for she is in bondage with her children;

For it is written, Rejoice, thou barren that bearest not; break out and cry, thou that travailest not; because the children of the desolate are more numerous than those of her that has a husband.

But what says the scripture? Cast out the maid servant and her son; for the son of the maid servant shall not inherit with the son of the free woman.