11:11, 12 Abraham’s faith regarding the promise of descendants was rewarded with the conception of Isaac, which was miraculous, since Sarah was barren and Abraham was (with respect to the possibility of reproduction) “as good as dead” (Rom. 4:19). Despite misguided alternatives (Gen. 16:1–4) and questioning doubts (Gen. 17:17, 18), in the end Abraham and Sarah “considered him faithful who had promised” (v. 11).