"A good preacher should have these qualities and virtues. First, he should be able to teach in a right and orderly way. Second, he should have a good head. Third, he should be able to speak well. Fourth, he should have a good voice. Fifth, a good memory. Sixth, he should know when to stop. Seventh, he should be sure of his material and be diligent. Eighth, he should stake body and life, good and honor on it. Ninth, he must suffer himself to be vexed and flayed by everybody."
Or, as my dear dad always says, “No souls are saved after the first twenty minutes!”