Moral: when you know something cannot be done, also remember the essential reason why, so later, when the circumstances have changed, you will not say, “It can’t be done.” Think of my error! How much more stupid can anyone be? Fortunately for my ego, it is a common mistake (and I have done it more than once), but due to my goof on the fft I am very sensitive to it now. I also note when others do it—which is all too often! Please remember the story of how stupid I was and what I missed, and do not make that mistake yourself. When you decide something is not possible, don’t say at a later date
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