If there is no contradictory impression, there is nothing to awaken reflection
Justice in the life and conduct of the State is possible only as first it resides in the hearts and souls of the citizens.
He who advises a sick man, whose manner of life is prejudicial to health, is clearly bound first of all to change his patient's manner of life.
The object of knowledge is what exists and its function to know about reality.
Do thine own work, and know thyself.
... for this discovery of yours will create forgetfulness in the learners' souls, because they will not use their memories; they will trust to the external written characters and not remember of themselves.