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"A clever general, therefore, avoids an army when its spirit is keen, but attacks it when it is sluggish and inclined to return. This is the art of studying moods.
Disciplined and calm, to await the appearance of disorder and hubbub amongst the enemy:-this is the art of retaining self-possession.
To be near the goal while the enemy is still far from it, to wait at ease while the enemy is toiling and struggling, to be well-fed while the enemy is famished:-this is the art of husbanding one's strength.
To refrain from intercepting an enemy whose banners are in perfect order, to refrain from attacking an army drawn up in calm and confident array:-this is the art of studying circumstances."

(SUN TZU, The Art of War)