He ought to express that he doesn't have a clue about the response and welcome others to share their thoughts.
From the Longman Dictionary of Modern English, "I ought to know" means to know something because you made it, experienced it, or something similar. "Are you sure there is no sugar in this coffee?" Obviously. I made it, so I should be aware!
There are three fundamental components to a good conclusion: a reiteration of the thesis of the speech; a summary of the main points that were talked about in the speech; and a final device that aids in the formation of a long-lasting impression in the minds of the audience.
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