Seneca · On ill-health and endurance of suffering
Letters 67.12
Was it not in this fashion, think you, that Regulus prayed that he might reach Carthage? Clothe yourself with a hero’s courage, and withdraw for a little space from the opinions of the common man. Form a proper conception of the image of virtue, a thing of exceeding beauty and grandeur; this image is not to be worshipped by us with incense or garlands, but with sweat and blood.
Seneca, Letters to Lucilius 67.12, translated by Richard Mott Gummere