Ambrose of Milan

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.

On the Decease of His Brother Satyrus, Book 2, Section 97 ↗