Je größerer Art die Maßnahmen werden, um so weniger kann man damit überraschen. - Carl von Clausewitz

history had no lessons or rules to offer the student, it could only broaden his understanding and strengthen his critical judgment.

...it is better to go on striking in the same direction than to move one's forces this way and that.

If the mind is to emerge unscathed from this relentless struggle with the unforeseen, 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.