In order not to be completely overcome by them, a certain strength of body and mind is required, which, either natural or acquired, produces indifference to them.

With these qualifications, under the guidance of simply a sound understanding, a man is at once a proper instrument for War; and these are the qualifications so generally to be met with amongst wild and half-civilised tribes.

If we go further in the demands which War makes on it, then we find the powers of the understanding predominating.

War is the province of uncertainty: three-fourths of those things upon which action in War must be calculated, are hidden more or less in the clouds of great uncertainty.

Here, then, above all a fine and penetrating mind is called for, to search out the truth by the tact of its judgment.
An average intellect may, at one time, perhaps hit upon this truth by accident; an extraordinary courage, at another, may compensate for the want of this tact; but in the majority of cases the average result will always bring to light the deficient understanding.
War is the province of chance.