I recently stumbled across a gem: the 1957 BYU Commencement Adress by Cecil B. Demille. That's right, the same Cecil B Demille who directed the film classic The Ten Commandments in 1956. It turns out that Demille was very close friends with the Prophet David O. Mckay, who gives the introduction.
Demille speaks in part about spirituality as it relates to his creative process, in part about his love and respect for the Mormon people, and in part about his convictions about the importance of following God's commandments. May more men like Mr. Demille arise in Hollywood— talented, uncorrupted and courageous.
Unfortunately the audio for the speech is not available, but the full get can be found here: