"Therefore every scribe who has been trained for the kingdom of Heaven is like the master of a household who brings out of his treasure what is new and what is old."That seems like a mandate for preaching, and a warning.
My prayer for myself (and those who preach today):
O God, grant me openness to the new, the creative, the wonder of your creation ever being created; show me a path into the depths of ancient wisdom of those who have come before me; guard me from my own foolishness and folly, from words that hurt, and guide me words that inspire, comfort and challenge us to build your kingdom. Amen.