Francis Hutcheson also accepted this convergence between public and private interest, but he attributed the mechanism, not to rational self-interest, but to personal intuition, which he called a "moral sense". Smith developed his own version of this general principle in which six psychological motives combine in each individual to produce the common good. In "The Theory of Moral Sentiments", vol. II, page 316, he says, ""By acting according to the dictates of our moral faculties, we necessarily pursue the most effective means for promoting the happiness of mankind.""