OK, here’s the story: Dick Cavett was interviewed for an article in some magazine (probably TV Guide) back (late 1970s probably). Among other things, he recounted interviewing anthropologist Ashley Montagu. While he didn’t give specifics on it, he said that at some point Montague had chided him as being “frivolous.” Cavett responded with (as I recall) a quote: “Do not assume that because I am frivolous that I am shallow, any more than I assume that because you are grave that you are profound.”
Possibly he made it up on the spot, but I got the idea he was quoting someone. Any ideas???