With an imperious gesture, Katerina Ivanovna seized Alyosha by both hands.
“Follow him! Overtake him! Don’t leave him alone for a minute!” she said, in a hurried whisper. “He’s mad! Don’t you know that he’s mad? He is in a fever, nervous fever. The doctor told me so. Go, run after him....”
Alyosha jumped up and ran after Ivan, who was not fifty paces ahead of him.
“What do you want?” He turned quickly on Alyosha, seeing that he was running after him. “She told you to catch me up, because I’m mad. I know it all by heart,” he added irritably.
“She is mistaken, of course; but she is right that you are ill,” said Alyosha. “I was looking at your face just now. You look very ill, Ivan.”
Ivan walked on without stopping. Alyosha followed him.
“And do you know, Alexey Fyodorovitch, how people do go out of their mind?” Ivan asked in a voice suddenly quiet, without a trace of irritation, with a note of the simplest curiosity.
“No, I don’t. I suppose there are all kinds of insanity.”
“And can one observe that one’s going mad oneself?”
“I imagine one can’t see oneself clearly in such circumstances,” Alyosha answered with surprise.