> A definition by which every human alive ever qualifies as a magician

Exactly correct.

Chapter 2: "No, every act of your life is a magical act; whenever from ignorance, carelessness, clumsiness or what not, you come short of perfect artistic success, you inevitably register failure, discomfort, frustration. [...] Why should you study and practice Magick? Because you can't help doing it, and you had better do it well than badly."

If you called him on it he would say that was on purpose, then talk your ears off about how. He was a ferociously effective charlatan, which is why people still remember the name he made up for himself. (And even invented a rhyming couplet to prate as a pronunciation guide!)