Letters 18.3

I am sure that, if I know you aright, playing the part of an umpire you would have wished that we should be neither like the liberty-capped throng in all ways, nor in all ways unlike them; unless, perhaps, this is just the season when we ought to lay down the law to the soul, and bid it be alone in refraining from pleasures just when the whole mob has let itself go in pleasures; for this is the surest proof which a man can get of his own constancy, if he neither seeks the things which are seductive and allure him to luxury, nor is led into them.

Seneca, Letters to Lucilius 18.3, translated by Richard Mott Gummere