It sounds brutal, but we too are supposed to be "casting out Hagar" and the covenant that she represents. That is the "covenant" of works, of effort, of trying, rather than the covenant of TRUST. To get to the object of our trust, Jesus, we've got to elevate a particular family: Abraham's son Isaac's. Watch 7 min
https://www.youtube.com/channel/UCNijvDWAn2Wv2KFun2AnvCA