The most powerful man alive writes a private note to himself reminding him not to be arrogant, not to be provoked by fools, and not to forget he is going to die.

That is the Meditations, and its value is entirely in that fact. Marcus Aurelius produced no new Stoic doctrine — his philosophy is Epictetus' almost entirely, and he says so. What no other text in the tradition provides is the record of somebody trying to actually use it, badly, repeatedly, under conditions that would defeat most people.

The job

Emperor from 161 to 180, most of it difficult. The Antonine plague killed a large share of the population. The Marcomannic Wars kept him on the Danube frontier for years, and much of the book was written in camp. His co-emperor died, several of his children died, and one of his generals declared himself emperor in Syria.

He also owned slaves, prosecuted wars of conquest, and persecuted Christians as a matter of policy — which are not footnotes. A reader who takes the book as the testimony of a good man should know that the goodness is being asserted by the man himself in his own notebook.

What philosophy in use looks like

The recurring problems are the problems of somebody with too much power and too little time.

Other people. He begins entries by preparing for the day's supply of ingratitude and arrogance, on the reasoning that being surprised by it is the avoidable part.

Vanity. Repeated reminders that the office is not him, that posthumous fame is worth nothing because the people remembering are also going to die, and that the purple robe is wool dyed with shellfish blood.

Anger. More entries on this than on anything else, which tells you something about the man that the calm reputation does not.

Death. Constantly, and without morbidity. The purpose is to make present action serious rather than to induce gloom.

The distinctive Stoic disciplines run through all of it: strip an event of the appraisal you have added to it, distinguish what is yours from what is not, take the cosmic view until the proportions come right, accept what has already happened — which is amor fati.

Why it reads the way it does

It is not addressed to you. That is the single most important fact about the book, and the reason it survives being quoted badly for two thousand years.

There is no audience being persuaded, no case being built, no reputation being managed. The repetition — and there is a great deal of it — is the record of a man who keeps having to tell himself the same things because they keep not sticking. Which is what practice actually looks like, and why the book is more useful than any systematic treatment of the same doctrines.