6.25

Chapter: Weak Points and Strong 6.25
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Translation:

In making tactical dispositions, the highest pitch you can attain is to conceal them; conceal your dispositions, and you will be safe from the prying of the subtlest spies, from the machinations of the wisest brains.

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Commentary

In war, spying and intelligence is a subtle and important strand of activity. The enemy may infiltrate their own people into your troops. Your officer may be bribed or blackmailed. Hidden observers may see your preparations.

This means that the more important your intent, the more secret you must keep it, right up until deployment. Knowing who you can absolutely trust is also very important.