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Orison Swett Marden: A self-controlled mind is a free mind, and freedom is power.

A self-controlled mind is a free mind, and freedom is power.
Orison Swett MardenSourced
Source
From the book Architects of Fate; or, Steps to Success and Power, Architects of Fate; or, Steps to Success and Power (1895), Chapter XVI, Self-Mastery

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