I think that nonviolent resistance is the most potent weapon available to oppressed people in their struggle for freedom and human dignity. It has a way of disarming the opponent. It exposes his moral defenses. It weakens his morale and at the same time it works on his conscience.
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Gender-neutral version:

I think that nonviolent resistance is the most potent weapon available to oppressed people in their struggle for freedom and human dignity. It has a way of disarming the opponent. It exposes their moral defenses. It weakens their morale and at the same time it works on their conscience.