The enemy is within.

Other lines from this film

• How do you find an enemy who is hidden right before your eyes?featured
• The secret is out.
• Trust no one. Suspect everyone.
• At the height of the Cold War, only a master spy could be trusted to expose one of their own.

This wording in other films

One line, 2 films.

• Phantom (2013)

Similar meaning

Lines whose meaning sits closest, by embedding similarity.

Same sentence pattern