I Kings 2:45

Every great life has had in it some great renunciation.

Abraham began by letting go, and going out, and all the way it was just giving up: first his home, his father, and his past; next his inheritance to Lot, his selfish nephew; and finally the very child of promise on the altar of Moriah; but he became the father of the faithful, whose inheritance was as the sands of the sea and the stars of the heavens.