Knowing is different from doing and therefore theory must never be used as norms for a standard, but merely as aids to judgment.

...as man under pressure tends to give in to physical and intellectual weakness, only great strength of will can lead to the objective.

Knowledge must become capability.

Men are always more inclined to pitch their estimate of the enemy's strength too high than too low, such is human nature.

Although our intellect always longs for clarity and certainty, our nature often finds uncertainty fascinating.

All action takes place, so to speak, in a kind of twilight, which like a fog or moonlight, often tends to make things seem grotesque and larger than they really are.

The majority of people are timid by nature, and that is why they constantly exaggerate danger. all influences on the military leader, therefore, combine to give him a false impression of his opponent's strength, and from this arises a new source of indecision.