"Because--isn't it drilled into us constantly, from childhood on, an unquestioned platitude in the culture--? From William Blake to Lady Gaga, from Rousseau to Rumi to Tosca to Mister Rogers, it's a curiously uniform message, accepted from high to low: when in doubt, what to do? How do we know what's right for us? Every shrink, every career counselor, every Disney princess knows the answer: "Be yourself." "Follow your heart."