Letters 105.2

Now, of all these, contempt is the least harmful, so much so that many have skulked behind it as a sort of cure. When a man despises you, he works you injury, to be sure, but he passes on; and no one persistently or of set purpose does hurt to a person whom he despises. Even in battle, prostrate soldiers are neglected: men fight with those who stand their ground.

Seneca, Letters to Lucilius 105.2, translated by Richard Mott Gummere