I'm the UnSub.
— Any BAU agent (mainly Derek Morgan) in early episodes of Criminal Minds
Know the enemy not and the battle cannot be won. Know the enemy too much and the battle will be doubly lost.
— Naval Maxims, Lord Admiral Ravensburg, Warhammer 40,000
For the better cure of vice they think it necessary to study it, and the only efficient study is through practice.
— Samuel Butler