There exists a limit to the force even the most powerful may apply without destroying themselves. Judging this limit is the true artistry of government. Misuse of power is the fatal sin. The law cannot be a tool of vengeance, never a hostage, nor a fortification against the martyrs it has created. You cannot threaten any individual and escape the consequences.
Attributed to: Stilgar
From Chapter 22 of Dune Messiah by Herbert, Frank