An interview is like travelling through a strange new land. You do not know the topography nor whom you can trust. What you can rely upon is simply being who you are, and expressing your values and principles. Your self-possession, sincerity and integrity will then shine through to whomever you encounter.
Your dignity and sincerity then colour your answers and questions and the interviewer will know that they are meeting someone with genuine self-confidence and be able to assess the fit without wondering if they are hearing the truth or not.
The Insider's Guide to Job Search - Canada/USA 