John Chrysostom

Any cloud passing over our skies may from time to time make us gloomy. But Paul's heart had no such storms sweeping over it. Or better, there did sweep over him, and often, many storms, but his day was not darkened. Rather in the midst of the temptations and dangers the light shone out. Thus when bound with his chain he kept exclaiming, "The word of God is not bound." Thus continually by means of that tongue the Word was sending forth its rays.