It is the power of the mind to be unconquerable.

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Original Citation

Seneca the Younger. De Vita Beata [On the Happy Life]. 58.

Current Citation

Seneca, Lucius Annasus. "De Vita Beata, Book VII, To Gallio: On the Happy Life." Moral Essays, Volume II. Translated by John W. Basore. The Loeb Classical Library. W. Heinemann, 1932.