Quotes by Interpersonal Skills The amateur salesman sells products; the professional sells solutions to needs and problems. Stephen Covey interpersonal-skills problem needs How you treat the one reveals how you regard the many, because everyone is ultimately a one. Stephen Covey interpersonal-skills 7-habits treats To Retain those who are present, be loyal to those who are absent. Stephen Covey interpersonal-skills 7-habits loyal Treat them all the same by treating them differently. Stephen Covey interpersonal-skills 7-habits treats You can't talk your way out of a problem you behaved your way into! Stephen Covey interpersonal-skills problem way