I dreamt that I was helping some famous cooks write a recipe of one of their cakes. I do not remember much about the recipe itself, which took much effort on my part, but I remember realizing that being a great cook makes it impossible to explain exactly what you are doing. Whence the proverb that came out of the exercise: making a cake and writing about it, too. Impossible, of course. When I woke up in the morning, I realized that it applied to many more activities besides cooking, just like the English proverb that is at its foundations: having a cake and eating it, too. Impossible, it goes without saying.