Joy is the very source of power in Christian living. “Rejoice in the Lord alway,” that means always. That means that regardless of the day, whether it’s dark or bright, whether it’s difficult or easy, whether we are facing problems and temptations or whether we are sailing through the sky on cloud nine. That is the thing that we are told and commanded. And this is a commandment now for believers. “Rejoice in the Lord alway: and again I say”—he repeats it in case we missed it—"rejoice.” Rejoice.