"Still I refused to let my mind follow the channel it was getting into. Evelyn had never given any evidence of any psychological weakness or 'nerves'; she's always been a level-headed girl, wholesome and natural. But I began to think she was subject to crazy impulses. Most of us have felt the impulse to leap from tall buildings. And sometimes a person feels a blind, childish and utterly reasonless urge to harm someone. We pick up a pistol, and the thought suddenly enters our mind how easy it would be to send our friend, who sits smiling and unaware, into eternity with a touch of the trigger. Of course we don't do it, but the impulse is there. So I thought perhaps some lack of mental discipline made Evelyn susceptible to these unguided impulses, and unable to control them."