One of the chief reasons for violence is hatred. And
hatred is mainly the result of negative thinking.
Positive thinking and hatred do not go together.
This being so, to maintain a peaceful society, it is
essential that positive thinking should never be
discouraged. Events should be explained in such a
way that people do not lapse into negative thinking,
but on the contrary, feel stimulated to think along
positive lines.
Ref -The Ideology of Peace
- by Maulana Wahiduddin Khan