Kenneth Clark, Civilisation, from episode 12, The Fallacies of Hope, BBC2 television, 1969.
From the Foreword to the book version, John Murray and BBC, 1969, and surely referring in part to the Fidelio passage:
“I cannot distinguish between thought and feeling, and am convinced that a combination of words and music, colour and movement can extend human experience in a way that words alone cannot do. For this reason I believe in television as a medium, and was prepared to give up two years of writing to see what could be done with it. Thanks to skilful and imaginative directors and an expert camera crew, I believe that certain moments in the film were genuinely moving and enlightening.”