have the courage of your (own) convictions
From Longman Dictionary of Contemporary Englishhave the courage of your (own) convictionshave the courage of your (own) convictionsBRAVEto continue to say or do what you think is right even when other people may not agree or approve → courageExamples from the Corpushave the courage of your (own) convictions• Larry displayed the courage of his convictions by saying no to his supervisor.