2 Corinthians 12:9-10

And he said unto me, My grace is sufficient for thee:
 

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for my strength is made perfect in weakness. 

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Most gladly therefore will I rather glory in my infirmities, that the power of Christ may rest upon me. 

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Therefore I take pleasure in infirmities, in reproaches, in necessities, in persecutions, in distresses for Christ's sake: 

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for when I am weak, then am I strong.