Everything in war is very simple, but the simplest thing is difficult. The difficulties accumulate and end by producing a kind of friction that is inconceivable unless one has experienced war. ... Countless minor incidents - the kind you can never really foresee - combine to lower the general level of performance, so that one always falls short of the intended goal.
Carl von ClausewitzStrength of character does not consist solely in having powerful feelings, but in maintaining one's balance in spite of them.
Carl von ClausewitzThe more a leader is in the habit of demanding from his men, the surer he will be that his demands will be answered.
Carl von Clausewitz