"But sanctify the Lord God in your hearts, and always be ready to give a defense to everyone who asks you a reason for the hope that is in you, with meekness and fear...." ~ 1 Peter 3:15 (NKJV)
Have you ever suddenly found yourself confronted with an opportunity to bear witness for Christ, or the need to "speak into" someone's circumstance with life-changing words of faith and comfort, but seemingly having nothing of value to say? Just the other day, I had such an experience as a tug on my sleeve in a grocery store gave way to an unexpected encounter with a very dear old friend who is a follower of Jesus.
As one who is generally not short on words, I quickly engaged with the perfunctory "How are you?" but then sensed that I should simply "listen" to what was on his heart.