The protection he relied on for nearly thirty years was based on just two things. The same two things anybody uses to protect against any danger. The same way a nation protects itself against an enemy missile, the same way an apartment dweller protects himself against a burglar, the same way a boxer guards against a knockout blow. Detection and response. Stage one, stage two. First you spot the threat coming in, and then you react to it.

Tripwire, Prologue (1999).