Letters 120.19

When we see a person of such steadfastness, how can we help being conscious of the image of a nature so unusual? Particularly if, as I remarked, it was shown to be true greatness by its consistency. It is indeed consistency that abides; false things do not last. Some men are like Vatinius or like Cato by turns; at times they do not think even Curius stern enough, or Fabricius poor enough, or Tubero sufficiently frugal and contented with simple things; while at other times they vie with Licinus in wealth, with Apicius in banqueting, or with Maecenas in daintiness.

Seneca, Letters to Lucilius 120.19, translated by Richard Mott Gummere