For my Strength is made Perfect in Weakness

And he said unto me, My grace is sufficient for thee: for my strength is made perfect in weakness. Most gladly therefore will I rather glory in my infirmities, that the power of Christ may rest upon me. Therefore I take pleasure in infirmities, in reproaches, in necessities, in persecutions, in distresses for Christ's sake: for when I am weak, then am I strong.

2 Corinthians 12:9,10 KJV 

Hebrews the 11th chapter of Hebrews, and the 30--32nd verse, beginning, talking about faith.
Now what shall I more say? For the time would fail me to tell of Gideon... of Barak... Samson... Jephthah... David... Samuel, and of other prophets:
Who through faith subdued kingdoms, wrought righteousness, obtained promise, stopped the mouth of lions,
Quenched the violence of fire, escaped the edge of the sword, and out of weakness... made strong, waxed valiant in fight, turned to flight the alien--the armies of the aliens.
Women received their dead raised unto life... and others were tortured, not accepting deliverance; that they might obtain a better resurrection:
And others had trials... cruel mockings... scourging, yea, moreover of bonds... imprisonments:They were stoned, they were sawed asunder, they were tempted,... slain with the sword:... wandered about in sheepskins and goatskins; being destitute,... and tormented;
Watch this parenthesis.
(Of whom the world was not worthy:) they wandered in deserts, and in the mountains, and in dens and caves of the earth.
... all these, having obtained a good report through faith, received not the promise:
God having provided some better thing for us, that they without us should not be made perfect.