If a person knows not to which port he sails, no wind is favorable.
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Original Citation
Seneca the Younger. Epistulae Morales ad Lucilium [Moral Letters to Lucilius]. c. 65 AD.
Current Citation
Seneca, Lucius Annaeus. Letters on Ethics, translated by Margaret Graver and A. A. Long. University of Chicago Press, 2017.