The Apostle ascribes circumspection and prudence with a view also to the relation of Christians to pagans, and of paganism to Christians. Here also lies, in the nearest sense, the evil of the days.
Here too lies the need to ponder what, amid all changeability, constitutes the work of God's providence and His decrees.
According to blessed Jerome, the Apostle Paul speaks here as though saying: "O Ephesians, upon whom, after awakening from the sleep of this age, the Sun of righteousness, Christ the Lord, has shone! Walk carefully and wisely, not yielding to the changeability of time.
Let persecution follow upon persecution. Keep one course and care for one thing: not to change like the moon, as the unwise do, but to stand unwaveringly in what has once been begun.
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By doing good, we redeem the time and make it our own, instead of selling it to evil. We redeem the time when we turn evil days into good days, and make them days of the age to come instead of days of this age."
In every case, however, one must first consider what God wills, and then do what is recognized as pleasing to Him.