2 Corinthians 12:9

"And He said unto me, My grace is sufficient for thee; for my power is made perfect in weakness." That is to say, 'It is sufficient for thee that thou raisest the dead, that thou curest the blind, that thou cleansest lepers, that thou workest those other miracles; seek not also exemption from danger and fear and to preach without annoyances. But art thou pained and dejected lest it should seem to be owing to My weakness, that there are many who plot against and beat thee and harass and scourge thee? Why this very thing doth show My power. "For My power," He saith, "is made perfect in weakness," when being persecuted ye overcome your persecutors; when being harassed ye get the better of them that harass you; when being put in bonds ye convert them that put you in bonds. Seek not then more than is needed.' Seest thou how he himself assigns one reason, and God another? For he himself says, "Lest I should be exalted overmuch, there was given to me a thorn;" but he says that God said He permitted it in order to show His power. 'Thou seekest therefore a thing which is not only not needed, but which also obscureth the glory of My power.' For by the words, "is sufficient for thee," He would signify this, that nothing else need be added, but the whole was complete. So that from this also it is plain that he does not intend pains in the head; for in truth they did not preach when they were sick, for they could not preach when ill; but that harassed and persecuted, they overcame all. 'After having heard this then,' he says, "Most gladly therefore will I glory in my weaknesses." For that they may not sink down, when those false Apostles are glorying over their contrary lot and these are suffering persecution, he shows that he shineth all the brighter for this, and that thus the power of God shines forth the rather, and what happens is just matter for glorying. Wherefore he says, "Most gladly therefore will I glory." 'Not as therefore sorrowing did I speak of the things which I enumerated, or of that which I have just now said, "there was given to me a thorn;" but as priding myself upon them and drawing to myself greater power.' Wherefore also he adds, "That the strength of Christ may rest upon me." Here he hints at another thing also, namely, that in proportion as the trials waxed in intensity, in the same proportion the grace was increased and continued.