Ephesians 2:8-9

8:For by grace are ye saved through faith; and that not of yourselves: it is the gift of God:

9:Not of works, lest any man should boast.

2 Corinthians 12:9

9: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.