Against the idea that the world and human life may be provided in its most inner with a one and only structure of a, say, “in itself”, Wittgenstein provides the figurative image of a thread:
“For instance the kinds of number form a family in the same way. Why do we call something a ‘number’? Well, perhaps because it has a direct relationship with several things that have hitherto been called number; and this can be said to give it an indirect relationship to other things we call the same name. And we extend our concept of number as in spinning a thread we twist fibre on fibre. And the strength of the thread does not reside in the fact that some one fibre runs through its whole length, but in the overlapping of many fibres.”
With this image Wittgenstein wants to express, that we live our lives aesthetically, awaiting, morally, economical, giving, psychological, affirming, confronting, scientifically, mechanical, forgiving, improvising, fearing, technical, trusting, believing, experimental, hoping, loving etc. in a world that reflects all this colourful variety.
So to meditate on one’s own life means to look at it like a thread, and to look very closely. Watching each fibre to recognize the things that went good or bad, to stand by the things to be proud of or to be embarrassed by, to realize where one didn’t change and where one turned on one’s heels etc.
Well, if you like so, maybe just take one thread and meditate on your life—for whatever reason you like. If you don’t know how to start, maybe have a look at this wonderful short film by Vaïana Gauthier: