preaching when you're dry

In a piece on Preaching Living Water When Your Well Has Run Dry (Part 2), Mark D. Roberts concludes with this:

Thus, ironically, we may be more effective channels of living water when we are spiritually dry than when we are spiritually hydrated. Admitting our thirst, we are ready for God's refreshment. Confessing our neediness, we are open to God's help. When we're dry, our illustrations may not be as polished, our prose not as poetic. But in our dependence upon the living water of the Spirit, we may actually be better able to offer this water to those who are thirsty.