John Cleese: “Now I suggest to you that a group of us could be sitting around after dinner, discussing matters that were extremely serious like the education of our children, or our marriages, or the meaning of life, and we could be laughing, and that would not make what we were discussing one bit less serious.

There’s also a great anecdote from Nobel-winning physicist Richard Feynman, where he talks about how physics used to delight him when he used to play with it, but then it started to disgust him when he got burdened by this idea that he was obligated to advance the future of science. That he was supposed to be doing “important” work.