The happiness of your life depends upon the quality of your thoughts: therefore, guard accordingly, and take care that you entertain no notions unsuitable to virtue and reasonable nature.

Marcus Aurelius (AD 121-180) Roman emperor (161-180), Stoic philosopher
Meditations, Book 3, #9 [tr. Collier (1701)]

Alternate translations:

  • "Use thine opinative faculty with all honour and respect, for in her indeed is all: that thy opinion do not beget in thy understanding anything contrary to either nature, or the proper constitution of a rational creature." [tr. Casaubon (1634), #10]
  • "Reverence the faculty which produces opinion. On this faculty it entirely depends whether there shall exist in thy ruling part any opinion inconsistent with nature and the constitution of the rational animal." [tr. Long (1862)]
  • "Hold in honor your opinionative faculty, for this alone is able to prevent any opinion from originating in your guiding principle that is contrary to Nature or the proper constitution of a rational creature." [tr. Zimmern (1887)]
  • "Reverence your faculty of judgement. On this it entirely rests that your governing self no longer has a judgement disobedient to Nature and to the estate of a reasonable being." [tr. Farquharson (1944)]

Added on 1-Feb-04 | Last updated 10-Mar-21
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