Credibility is an important element of both the professional and private life and should serve as one of the indicators of success and trust. Lies, withholding facts and information, manipulation, presenting solely the "pretty side" have been labelled by experts as credibility killers. Today's society offers various mechanisms for influencing public opinion, and a politician's success depends on his/her ability to use to their advantage the tools of communication and persuasion. The cornerstones of credibility include: transparency, truthfulness, and authenticity. Transparency plays a deciding role. Truthfulness brings to the fore honesty in both verbal expression and action. Words uttered must fit the truth. Thoughts conceived must fit the truth. Actions performed must fit the truth. Reliable, confidential, and honest information does not stem from cheating or deception. Apart from the three aforementioned pillars of credibility, one extremely important rule is congruent communication: the unity of thoughts, words, and actions.