97 He believed that he when old could beget a son, and judged himself when a father able to sacrifice his son; nor did his fatherly affection tremble when duty aided the right hand of the old man, for he knew that his son would be more acceptable to God when sacrificed than when whole. Therefore he brings his well-beloved son to be sacrificed, and offered promptly him whom he had received late; nor is he restrained by being called by the name of father, when his son called him “Father,” and he replied, “My son.”
Dear pledges of love are these names, but the commands of God are loved still more. And so although their hearts felt for each other, their purpose remained firm. The father's hand stretched out the knife over his son, and the father's heart struck the blow that the sentence might not fail of being carried out; he feared lest the stroke should miss, lest his right hand should fail. He felt the movings of fatherly affection, but did not shrink from the work of submission, and hastened his obedience, even when he heard the voice from heaven. Let us then set God before all those whom we love, father, brother, mother, that He may preserve for us those whom we love, as in the case of Abraham we behold rather the liberal Rewarder than the servant.
Source: On the Death of Satyrus (New Advent)