Two qualities are indispensable: first, an intellect that, even in the darkest hour, retains some glimmerings of the inner light which leads to truth; and second, the courage to follow this faint light wherever it may lead.
Carl von ClausewitzThis tremendous friction which cannot, as in mechanics, be reduced to a few points, is everywhere in contact with chance, and brings about effects that cannot be measured just because they are largely due to chance.
Carl von ClausewitzThere is nothing more common than to find considerations of supply affecting the strategic lines of a campaign and a war.
Carl von Clausewitz