The words we use and our intonation form part of an unconscious selection process. 

The use of certain words can rule you out of contention for a job or a piece of business.

Negative words must be avoided and the use of positive ones used carefully.

When we are nervous we sometimes start prefixing sentences with a word that undermines what we are trying to say.

If you pay a little more attention to the sentiment of your words, it may make all the difference in your interview.