Seneca · On the healing power of the mind

Letters 78.3

Now I shall tell you what consoled me during those days, stating at the outset that these very aids to my peace of mind were as efficacious as medicine. Honourable consolation results in a cure; and whatever has uplifted the soul helps the body also. My studies were my salvation. I place it to the credit of philosophy that I recovered and regained my strength. I owe my life to philosophy, and that is the least of my obligations!

Seneca, Letters to Lucilius 78.3, translated by Richard Mott Gummere