On the advice of the wisest: whom to speak to, how, and when—so as to be heard. Look at them, where they're going!
It certainly adds up to the fact that all the skills and stages are important for sure. The ability to competently and professionally hold a conversation with the customer is not the least important tool of the seller.
‘Of the modes of persuasion furnished by the spoken word there are three kinds. The first kind depends on the personal character of the speaker; the second on putting the audience into a certain frame of mind; the third on the proof, provided by the words of the speech itself.’
‘It is not sufficient to know what one ought to say, but one must also know how to say it.’
‘You must disguise your art and give the impression of speaking naturally and not artificially.
…generally speaking, that which is true and better is naturally always easier to prove and more likely to persuade.’
‘Four reasons contributing to the coldness of style: 1) the use of complex words, 2) unusual expressions, 3) improper use of epithets, 4) the use of inappropriate metaphors.’