Yes ~ I'd seen this paraphrased somewhere some months ago and couldn't remember who said it or where I'd found it, I'm really glad you posted this and as it was originally written. I know it couldn't be more true.
The quote I use in tandem to this, is by the (anonymous) author of "Cloud of Unknowing"...it goes:
"Be so fervently occupied in spirit that you take little heed or none by what men say about you or by what they do."
I haven't read Aurelius' other meditations but would like to know what Random means by him "never reaching full satisfaction". One thing's for sure, it's tragic when people don't try at all. I'm guessing he did reach full satisfaction.
What I tend to think is that the most introspective people have many of the answers worked out within and what they express outwardly are merely tests, ruling out what they're quite sure is wrong to begin with. Judging them by this, you'd think they were struggling.