You may leave this life at any moment: have this possibility in your mind in all that you do or say or think. Now departure from the world of men is nothing to fear, if gods exist; because they would not involve you in any harm. If they do not exist, or if they have no care for humankind, then what is life to me in a world devoid of gods, or devoid of providence? (2.11.1)
You've heard this before, whether or not you've wanted to: keep your death in mind, 'cause it's gonna come sooner or later. Marcus is a huge advocate of this line of thought and sometimes pursues it to the edge of morbidity. In this case, he assures himself that no real harm can come to him from death, since it's ordained by the gods, who are completely benevolent. If they say it must be, then there's a good reason for it.