Here is Meditation 5.23 in full:
Often think of the rapidity with which things pass by and disappear, both the things which are and the things which are produced. For substance is like a river in a continual flow, and the activities of things are in constant change, and the causes work in infinite varieties; and there is hardly anything which stands still. And consider what is near to you, this boundless abyss of the past and of the future in which all things disappear. How then is he not a fool who is puffed up with such things or plagued about them and makes himself miserable? For they vex him only for a time, and a short time.
I am no expert but this view of the transient nature of all things seems very close to Buddhist ideas that everything is in a state of flux and that constantly shifting conditions lead to an endless arising and falling away of things.