Philo Judaeus Quod Omnis Probus Liber Sit 24

[24] for the man who out of a lowly and slavish spirit submits himself to lowly and slavish actions in spite of his deliberate judgment, is really and truly a slave; but he who adapts his circumstances and actions to the present occasion, and who voluntarily and in an enduring spirit bears up against the events of fortune, not looking at any thing of human affairs as extraordinary, but having by diligent consideration fully assured himself that all divine things are honoured by eternal order and happiness; and that all mortal things are tossed about in an everlasting storm and ¹ fluctuation of affairs so as to be subject to the greatest variety of changes and vicissitudes, and who, from those considerations, bears all that can befall him with a noble courage, is at once both a philosopher and a free man.