First ensured
 
 His own
 
 Invulnerability;
 
 Then he waited for
 
 The enemy’s
 
 Vulnerability.
 
 Invulnerability rests
 
 With self;
 
 Vulnerability,
 
 With the enemy.
 
 The Skilful Warrior
 
 Can achieve
 
 His own
 
 Invulnerability;
 
 But he can never bring about
 
 The enemy’s
 
 Vulnerability.
 
 Hence the saying
 
 ‘One can know
 
 Victory
 
 And yet not achieve it.’
 
 Invulnerability is
 
 Defence;
 
 Vulnerability is
 
 Attack.
 
 Defence implies
 
 Lack;
 
 Attack implies
 
 Abundance.
 
 A Skilful Defender