Research in attitude change suggests that in order to be a credible source, a communicator should be both:

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Research shows that a communicator who is seen as both an expert and trustworthy is more likely to be perceived as credible and influential in attitude change. This is because expertise gives the audience confidence in the communicator's knowledge and ability to provide accurate information, while trustworthiness ensures that the audience believes the communicator has their best interests in mind and is not trying to deceive or manipulate them. Being respected and feared (choice B) may create compliance in the short term, but is unlikely to lead to genuine attitude change. Attractiveness and intelligence (choice C) are not necessarily related to credibility and may not have a direct impact on attitude change. Trustworthiness and intelligence (choice D) are important factors, but expertise is a stronger predictor of credibility.

Research in Attitude Change Suggests That in Order to Be