Meditations 10.32

Let it not be in any man's power to say truly of thee that thou are not simple or that thou art not good; but let him be a liar whoever shall think anything of this kind about thee; and this is altogether in thy power. For who is he that shall hinder thee from being good and simple? Do thou only determine to live no longer unless thou shalt be such. For neither does reason allow [thee to live], if thou art not such.

Marcus Aurelius, Meditations 10.32, translated by George Long

Give no one the right to say of thee with truth that thou art not a sincere, that thou art not a good man, but let anyone that shall form any such an idea of thee be as one that maketh a lie. All this rests with thee. For who is there to hinder thee from being good and sincere? Resolve then to live no longer if thou be not such. For neither doth Reason in that case insist that thou shouldest.

Marcus Aurelius, Meditations 10.32, translated by C. R. Haines