“During the last week of that month Ivan himself began to feel very ill. He went to consult the Moscow doctor who had been sent for by Katerina Ivanovna just before the trial. And just at that time his relations with Katerina Ivanovna became acutely strained. They were like two enemies in love with one another.
Katerina Ivanovna's «returns» to Mitya, that is, her brief but violent revulsions of feeling in his favor, drove Ivan to perfect frenzy. Strange to say, until that last scene described above, when Alyosha came from Mitya to Katerina Ivanovna, Ivan had never once, during that month, heard her express a doubt of Mitya's guilt, in spite of those «returns» that were so hateful to him.”