Condemnation by category is the lowest form of hatred, for it is cold-hearted and abstract, lacking even the courage of a personal hatred. Categorical condemnation is the hatred of the mob. It makes cowards brave. And there is nothing more fearful than a religious mob, a mob overflowing with righteousness – as at the crucifixion and before and since. This can happen only after we have made a categorical refusal to kindness: to heretics, foreigners, enemies or any other group different from ourselves.