Letters 76.32

This is the error under which we labour; this is the reason why we are imposed upon: we value no man at what he is, but add to the man himself the trappings in which he is clothed. But when you wish to inquire into a man’s true worth, and to know what manner of man he is, look at him when he is naked; make him lay aside his inherited estate, his titles, and the other deceptions of fortune; let him even strip off his body. Consider his soul, its quality and its stature, and thus learn whether its greatness is borrowed, or its own.

Seneca, Letters to Lucilius 76.32, translated by Richard Mott Gummere