imagine, for instance, that he would sometime leave off thinking, get
up and simply go there.... Even his late experiment (i.e. his visit with
the object of a final survey of the place) was simply an attempt at
an experiment, far from being the real thing, as though one should say
"come, let us go and try it--why dream about it!"--and at once he
had broken down and had run away cursing, in a frenzy with himself.
Meanwhile it would seem, as regards the moral question, that his
analysis was complete; his casuistry had become keen as a razor, and he
could not find rational objections in himself. But in the last resort
he simply ceased to believe in himself, and doggedly, slavishly sought
arguments in all directions, fumbling for them, as though someone were
forcing and drawing him to it.

At first--long before indeed--he had been much occupied with one
question; why almost all crimes are so badly concealed and so easily
detected, and why almost all criminals leave such obvious traces? He
had come gradually to many different and curious conclusions, and in his
opinion the chief reason lay not so much in the material impossibility
of concealing the crime, as in the criminal himself. 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.