Letters 76.29

But that man also who is deprived of this joy, the joy which is afforded by the contemplation of some last noble effort, will leap to his death without a moment’s hesitation, content to act rightly and dutifully. Moreover, you may confront him with many discouragements; you may say: “Your deed will speedily be forgotten,” or “Your fellow-citizens will offer you scant thanks.” He will answer: “All these matters lie outside my task. My thoughts are on the deed itself. I know that this is honourable. Therefore, whithersoever I am led and summoned by honour, I will go.”

Seneca, Letters to Lucilius 76.29, translated by Richard Mott Gummere