Seneca · On festivals and fasting
Letters 18.4
It shows much more courage to remain dry and sober when the mob is drunk and vomiting; but it shows greater self-control to refuse to withdraw oneself and to do what the crowd does, but in a different way,—thus neither making oneself conspicuous nor becoming one of the crowd. For one may keep holiday without extravagance.
Seneca, Letters to Lucilius 18.4, translated by Richard Mott Gummere