Power?

“There are Sunday school teachers, Christian elders, and friends whose teaching has no power! They never see the fulfillment of the hope: Sinners shall be converted unto thee. It is not from lack of teaching the truth, but from failing to speak about a living experience of this grace. They teach from a knowledge of the truths of Scripture or refer to an earlier spiritual experience. But this is not enough. If you want to see teaching and conversion of sinners, you must have a living effective experience of the grace of God.”—Andrew Murray

<idle musing>
That's right; trying to live on an experience that is 20 years old, or 2 days old, won't do it. If your experience with God is not a moment-by-moment reliance on him, you have nothing to offer.
</idle musing>