Letters 9.21

In order, however, that you may know that these sentiments are universal, suggested, of course, by Nature, you will find in one of the comic poets this verse:

Unblest is he who thinks himself unblest.

For what does your condition matter, if it is bad in your own eyes?

Seneca, Letters to Lucilius 9.21, translated by Richard Mott Gummere