Almost every criminal is subject to a failure of will and reasoning power by a childish and phenomenal heedlessness, at the very instant when prudence and caution are most essential.

It was his conviction that this eclipse of reason and failure of will power attacked a man like a disease, developed gradually and reached its highest point just before the perpetration of the crime, continued with equal violence at the moment of the crime and for longer or shorter time after, according to the individual case, and then passed off like any other disease.

The question whether the disease gives rise to the crime, or whether the crime from its own peculiar nature is always accompanied by something of the nature of disease, he did not yet feel able to decide.
When he reached these conclusions, he decided that in his own case there could not be such a morbid reaction, that his reason and will would remain unimpaired at the time of carrying out his design, for the simple reason that his design was "not a crime...." We will omit all the process by means of which he arrived at this last conclusion; we have run too far ahead already....

We may add only that the practical, purely material difficulties of the affair occupied a secondary position in his mind.

"One has but to keep all one's will-power and reason to deal with them, and they will all be overcome at the time when once one has familiarised oneself with the minutest details of the business...." But this preparation had never been begun.