Literature has often noted an affinity between strong emotions and the ability for people to experience a radical shift from one to the other. In one of the Faustian plays - I thought it was von Goethe's, but I've been through it with a fine-toothed eyelash trying to find the the passage without success - the eponymous protagonist is confronted with a number of demons offering terms for possession of his soul. He says he will give it to the one who will deliver his wants the fastest. Mephistopheles wins by promising to be "...as swift as the change from love to hate...". The English Restorationist playwright William Congreve, in his play "The Mourning Bride" (1697), wrote the line, “Heav...

Literature has often noted an affinity between strong emotions and the ability for people to experience a radical shift from one to the other. In one of the Faustian plays - I thought it was von Goethe's, but I've been through it with a fine-toothed eyelash trying to find the the passage without success - the eponymous protagonist is confronted with a number of demons offering terms for possession of his soul. He says he will give it to the one who will deliver his wants the fastest. Mephistopheles wins by promising to be "...as swift as the change from love to hate...". The English Restorationist playwright William Congreve, in his play "The Mourning Bride" (1697), wrote the line, “Heaven has no rage like love to hatred turned...".

Hate manifests itself in different ways depending on the individual. Some people are calculating, others give way to blind range. It doesn't seem all that obvious to me without knowing something of the temperament of the individual.