Remember that to change thy mind and to follow him that sets thee right, is to be none the less the free agent that thou wast before.

Meditations. viii. 16.

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Look to the essence of a thing, whether it be a point of doctrine, of practice, or of interpretation.

Meditations. viii. 22.

A man's happiness,—to do the things proper to man.

Meditations. viii. 26.

Be not careless in deeds, nor confused in words, nor rambling in thought.

Meditations. viii. 51.

He that knows not what the world is, knows not where he is himself. He that knows not for what he was made, knows not what he is nor what the world is.