Regarding language we use in business, comment on this quote: "It is not about what you say; it is all about how you say it."

This refers to the important issue of what the components
of communication are. The answer is that Communication has been segmented into 3
distinctive components- the Verbal or the language based part, the Nonverbal which deals
with body language etc and that is not conveyed through language or words and thirdly,
paralanguage which is to do with how we use elements like tone of voice, pitch, accent,
diction, speed and volume to convey the message.

The quote
in your question is correct to a large extent. As Albert Mehrabian has said, verbal
language constitutes only 7 percent of your communication whereas the nonverbal (55
percent) and paralanguage (38 percent) form the 93 percent. He however qualified his
theory by saying that this holds true mostly in communication that has a lot to do with
emotions and feelings.

However, experts agree that the
"how" of communication makes a huge difference to what you want to convey and what is
understood by the receiver of your communication. For example, if you were to say "Sit
down" to someone in a normal voice, the paralanguage indicates a normal state of
affairs. But if you were to shout and say"Sit down" to the same person, the meaning of
your communication has changed completely. So it is not just the words you use that
sends the message but also how you say it for the right message to be
conveyed.