Marcus Aurelius
Meditations 7.20
One thing only troubles me, lest I should do something which the constitution of man does not allow, or in the way which it does not allow, or what it does not allow now.
Marcus Aurelius, Meditations 7.20, translated by George Long
I am concerned about one thing only, that I of myself do not what man's constitution does not will, or wills not now, or in a way that it wills not.
Marcus Aurelius, Meditations 7.20, translated by C. R. Haines