Meditations by Marcus Aurelius Book 8 Page 30

it was? as either basely dejected, or disordinately affected, or confounded within itself, or terrified? What can there be, that thou shouldest so much esteem?

XLV. Nothing can happen unto thee, which is not incidental unto thee, as thou art a man. As nothing can happen either to an ox, a vine, or to a stone, which is not incidental unto them; unto every one in his own kind. If therefore nothing can happen unto anything, which is not both usual and natural; why art thou displeased? Sure the common nature of all would not bring anything upon any, that were intolerable.

If therefore it be a thing external that causes thy grief, know, that it is not that properly that doth cause it, but thine own conceit and opinion concerning the thing: which thou mayest rid thyself of, when thou wilt.