Humanism may seem bland and unexceptionable—who could be against human flourishing? But in fact it is a distinctive moral commitment, one that does not come naturally to the human mind. As we shall see, it is vehemently opposed not just by many religious and political factions but, amazingly, by eminent artists, academics, and intellectuals. If humanism, like the other Enlightenment ideals, is to retain its hold on people’s minds, it must be explained and defended in the language and ideas of the current era.