Woodrow Wilson knew the reality...
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Woodrow Wilson knew the reality of diminishing returns. He said, "If I am to speak for ten minutes, I need a week for preparation; if fifteen minutes, three days; if half an hour, two days; if an hour, I am ready now." Saint Paul said, "... our message came to you not in word only, but also in power and in the Holy Spirit and full of conviction...." Even if a preacher spends a week on a ten minute sermon, could it be this powerful?
