Nietzsche thought of envy as a confused but important signal from our deeper selves about what we really want. Everything that makes us envious is a fragment of our true potential, which we disown at our peril. We should learn to study our envy forensically, keeping a diary of envious moments, and then sift through episodes to discern the shape of a future, better self…. The envy we don’t own up to will otherwise end up emitting what Nietzsche called ‘sulfurous odours.’ Bitterness is envy that doesn’t understand itself.