He who fights the devil with his own weapons,

Related:

• He who has no mind to trade with the devil,
  should be so wise as to keep from his shop. --...
• If the devil doesn't exist, but man created him,
  he has created him in his own image. --...
• He who finds his foot...
  is seldom the one with it in his mouth...
• Man fights with his mind -
  his hands and his weapons are extensions of his will...
• He who fights and runs away lives to fight
  another day...
• I like a man who grins when he
  fights. ...
• I like a man who grins when he fights." -
  Winston...
• When a man's knowledge is deep, he speaks well of an enemy.
  Instead of seeking revenge, he extends unexpected generosity...
• He who shits on the road will meet flies on his return.
  South African...