Colossians 4: 5 - 6
5: Walk in wisdom toward them that are without, redeeming the time.
6: Let your speech be always with grace, seasoned with salt, that ye may know how ye ought to answer every man.
Ephesians 4: 29
29: Let no corrupt communication proceed out of your mouth, but that which is good to the use of edifying, that it may minister grace unto the hearers.
2 Corinthians 12: 9, 10
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.
10: 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.