I'm not sure if that's the kind of answer you are looking for but it makes me think of people who know things deeply and are able to adapt their speech to their audience.
If we take an example of a software developer, if your colleague or non-technical family member asks you a question, you won't answer the same way. But because this "successful professional" knows the ins and outs of his profession, he is able to communicate clearly the same thing to different people.
At least, this is what this quote made me think of.
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