Violence

Where there is no emotion,
there is no motive for violence.
- the character Spock in the Star Trek television series
[More about Causes of Violence]

Violence is the last refuge of the incompetent.
- Isaac Asimov

Through violence, you may 'solve' one problem,
but you sow the seeds for another.
- Tenzin Gyatso, the 14th Dalai Lama

Peace cannot be achieved through violence,
it can only be attained through understanding.
- Ralph Waldo Emerson

Further reading: Revenge, the Deadliest Sin?

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How to Deal with Anger - How to Deal with Fear