What is the meaning of Acts 26:27?

27 King Agrippa, believest thou the prophets? I know that thou believest. (Acts 26:27 KJV)

William Burkitt’s Commentary

The apostle, knowing that Agrippa was educated among the Jews, tells him that he could not but hear of the life, doctrine, miracles, death, and resurrection of Christ; all of which were done openly and not in corners: and he could not but believe the prophets and what they had foretold about the Messias; and if the power of worldly interest did not overcome him, his life and practice would be answerable to his faith and belief.
Thence learn that a right belief in the holy scriptures is of great efficacy and force to conform a person’s life to the practice of real and universal holiness.