Jean-Jacques Rousseau summed it all up in his novel Émile, the eighteenth-century bible of feeling. Rousseau held that, when looking for life’s rules of conduct, he found them ‘in the depths of my heart, traced by nature in characters which nothing can efface. I need only consult myself with regard to what I wish to do; what I feel to be good is good, what I feel to be bad is bad.’
