If you will discipline yourself to make your mind self-sufficient you will thereby be least vulnerable to injury from the outside. – Critias of Athens

Other Quotes from
Discipline
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A person who is trained to consider his actions, to undertake them deliberately, is in so far forth disciplined. Add to this ability a power to endure in an intelligently chosen course in the face of distraction, confusion, and difficulty, and you have the essence of discipline. – John Dewey
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