Luke 22:32
but I have prayed that your own faith may not fail. And you in turn must be a strength to your brothers."
Luke 22:43
[And an angel from heaven appeared to strengthen him;
Ephesians 4:29
Let no bad word pass your lips, but only such speech as is good for edification, as occasion may require, words that are gracious and a means of grace to those who hear them.
Colossians 4:6
let your talk always have a saving salt of grace about it, and learn how to answer any question put to you.
Hebrews 12:12
So up with your listless hands! Strengthen your weak knees!