Autores:
  • Tener el manejo de la mente es un gran arte, y se puede alcanzar en un grado considerable por la experiencia y el ejercicio habitual.

    James Boswell, Samuel Johnson (1824). "La vida de Samuel Johnson, LL. D., Comprehending an Account of His Studies, and Numerous Works, in Chronological Order: A Series of His Epistolary Correspondence and Conversations with Many Eminent Persons; and Various Original Pieces of His Composition, Never Before Published; the Whole Exhibiting a View of Literature and Literary Men in Great Britain, for Near Half a Century During which He Flourished", pág. 416.