Beware the fury of a patient man.

Often attributed as a 17th Century translation of a Latin maxim first recorded in the 1st Century B.C.E.

Meaning that the reaction from someone that is not quick to anger, waiting and planning their 'revenge', is much more terrible than the reaction from the hot-tempered.

Plan and consider your actions.

Do not react from fear.

Dispense Justice rather than exact Revenge.

Plan for all the ramifications of an action, so that ONLY a desired and SPECIFICALLY targeted outcome is attained.

Make your weapon a poniard, rather than a mob.

Be an assassin rather than a ravening horde.

Pick the exactly correct tool for the job: no more, no less. Apply it to the specific place necessary with only that force absolutely required.

Do not act from fear, but cold-blooded Necessity.

When ONLY one person or group is precisely targeted with no 'collateral damage', the results stand stark and unmistakable reminder of the consequences of their offenses.

Do the research so that only the guilty party is dealt with, no more, no less.

Your 'revenge' will be all the more terrifying.