John Chrysostom
But in what sense is it said, “This is the first commandment”? The first should have been called, “You shall not murder,” and “You shall not commit adultery.”
The Apostle calls this commandment first not in order, but in relation to the promise. Some commandments are directed against evil and toward the avoidance of evil, and no reward is attached to them.
To others, as guiding us toward the doing of good, a promise is also attached. Notice what a wondrous foundation for virtue the Apostle lays, and rightly, in honoring and respecting parents.
Having forbidden evil deeds, and intending to pass to teaching about good works, he first commands honor toward parents. After God, they are for us the chief authors of life.
Therefore they rightly have the first claim to taste good fruits from us, and afterward all other people. If someone is disrespectful toward parents, will he ever be respectful toward outsiders?