Meanings can be deduced from a reader's choice of words. The aim of Anderson's statement; “Anyone who has an idea worth sharing is capable of giving a powerful talk,” is;
Through his choice of words, we can see that the author wishes to infuse confidence into his readers. Perhaps, his audience was skeptical about their abilities to deliver powerful talks.
Through his speech, he encourages them to be confident so long as they have something worth sharing. This will erase any confusion or doubts in their minds.
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