But let no one accustom himself to swear from hearing that God sware unto Abraham. For just as anger, when spoken of |5 God, is not anger, nor implies passion, but signifies power exercised in punishment, or some similar motion; so neither is an oath an act of swearing. For God does not swear, but indicates the certainty of the event,----that that which He says will necessarily come to pass. For God's oath is His own word, fully persuading those that hear, and giving each one the conviction that what He has promised and said will certainly come to pass.