Meditations 3.9

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. And this faculty promises freedom from hasty judgment, and friendship towards men, and obedience to the gods.

Marcus Aurelius, Meditations 3.9, translated by George Long

Hold sacred thy capacity for forming opinions. With that it rests wholly that thy ruling Reason should never admit any opinion out of harmony with Nature, and with the constitution of a rational creature. This ensures due deliberation and fellowship with mankind and fealty to the Gods.

Marcus Aurelius, Meditations 3.9, translated by C. R. Haines