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If you are telling the truth, then you can speak gently, and your words will have power.

Chogyam Trungpa (2010). “The Collected Works of Chogyam Trungpa: Volume Eight: Great Eastern Sun; Shambhala; Selected Writings”, p.66, Shambhala Publications
If you are telling the truth, then you can speak gently, and your words will have power.