Let no corrupting talk come out of your mouths, but only that as is good for building up, as fits the occasion, that it may give grace to those who hear.
Truly edifying words are words that reveal the character, the promises and activity of God. They're cross-centered words. They're words rooted in and derived from Scripture, words that identify the active presence of God, and words that communicate the evidences of grace that you observe in others. They're words that flow from a humble heart.
-C J Mahaney (Humility)