Meditations of Marcus Aurelius Book XII
All those things at which thou wishest to arrive by a circuitous road, thou canst have now, if thou dost not refuse them to thyself. And this means, if thou wilt take no notice of all the past, and trust the future to providence, and direct the present only conformably to piety and justice. Conformably to piety, that thou mayest be content with the lot which is assigned to thee, for nature designed it for thee and thee for it. Conformably to justice, that thou mayest always speak the truth freely and without disguise, and do the things which are agreeable to law and according to the worth of each. And let neither another man's wickedness hinder thee, nor opinion nor voice, nor yet the sensations of the poor flesh which has grown about thee; for the passive part will look to this. If then, whatever the time may be when thou shalt be near to thy departure, neglecting everything else thou shalt respect only thy ruling faculty and the divinity within thee, and if thou shalt be afraid not because thou must some time cease to live, but if thou shalt fear never to have begun to live according to nature -- then thou wilt be a man worthy of the universe which has produced thee, and thou wilt cease to be a stranger in thy native land, and to wonder at things which happen daily as if they were something unexpected, and to be dependent on this or that.