The Daily Stoic is a great resource and I love their daily emails. This is from the 7th August, quoting Brand Blanshard on Marcus Aurelius:

“Few care now about the marches and counter marches of the Roman commanders. What the centuries have clung to is a notebook of thoughts by a man whose real life was largely unknown who put down in the midnight dimness of not the events of the day or the plans of the morrow, but something of far more permanent interest, the ideals and aspirations that a rare spirit lived by.”

I’ve only recently discovered the site, but they have a useful “beginners’ guide” here.

The above quotation, I think, originates from Brand Blanshard’s Four Reasonable Men.