Letters 93.7

Just as one of small stature can be a perfect man, so a life of small compass can be a perfect life. Age ranks among the external things. How long I am to exist is not mine to decide, but how long I shall go on existing in my present way is in my own control. This is the only thing you have the right to require of me,—that I shall cease to measure out an inglorious age as it were in darkness, and devote myself to living instead of being carried along past life.

Seneca, Letters to Lucilius 93.7, translated by Richard Mott Gummere