And mark an instance of unspeakable consideration. For not in respect of our parents only does He practise this reasoning, nor of our children, but with regard to our life, which is nearer than all; that the other point may thenceforth become unquestionable, and they may learn that they will in this way profit those of their kindred likewise, as much as may be; since so it is in the case even of our life, which is more essential to us than all.
Source: Homilies on the Gospel of St. Matthew (New Advent)