Your ability, as a salesperson, to effectively advice and tempt your prospects and/or consumers depends all on your dexterity to spread efficaciously. Yes, sometimes having a service to demonstrate, the handiness to use third delegation references, and the use of facts sources (articles, case studies, post of reference, brochures, information stories, etc) can lend a hand you deliver the goods gross revenue success, but I imagine that your free strongest mechanism/skill is your ability to effectively and well use terms - lines - when marketing to your prospects/customers.
Over the years, I have ascertained hundreds of salespeople, who delineate a assemblage of organizations commercialism both services and tactual products, mislay gross revenue and regulars because of their noesis to articulate concepts, accepted wisdom and benefits professionally.