And thou, Capernaum, shalt thou be exalted even to Heaven? Even to Hades shalt thou descend. For had the mighty works been done in Sodom which have been done in thee, it would have remained until now.

who were begotten as such not by human descent, nor through an impulse of their own nature, nor through the will of a human father, but from God.

who, as regards His human descent, belonged to the posterity of David,

In other words, it is not the children by natural descent who count as God's children, but the children made such by the promise are regarded as Abraham's posterity.