“When able to attack, we must seem unable; when using our forces, we must seem inactive; when we are near, we must make the enemy believe we are far away; when far away, we must make him believe we are near.”

Your actual capability and your apparent capability are two different levers. Sun Tzu advises you to look weak when strong, and distant when near, so the other side misjudges and moves against an illusion.
This is the first concrete device in Chapter 1’s closing catalogue of deceits — able seem unable, active seem inactive, near seem far. After announcing that war runs on deception, Sun Tzu immediately gets practical: these four reversals are the starter set. The pattern in every pair is the same: your real state and your displayed state are deliberately offset, so the enemy plans against a position you no longer hold.
A supplier believes its customer would find switching logistics providers too painful to attempt. The customer, meanwhile, has quietly built the alternative in-house — but keeps renewing softly, complaining about budget pressure. When the supplier pushes a 30% increase, the customer does not negotiate: it flips, and the supplier loses the account it thought was captive. The customer’s strength was real; its displayed weakness was the strategy.
Read as a one-off bluff, this gets people labelled unreliable. The instruction is sustained misdirection during the approach, not habitual false modesty. Signal weakness constantly and the market reprices you as weak — the offset only works while you can drop it at the moment of contact.