Letters 66.30

Any man who believes them to be unequal is turning his gaze away from the virtues themselves and is surveying mere externals; true goods have the same weight and the same width. The spurious sort contain much emptiness; hence, when they are weighed in the balance, they are found wanting, although they look imposing and grand to the gaze.

Seneca, Letters to Lucilius 66.30, translated by Richard Mott Gummere