Meditations is a series of personal writings by Marcus Aurelius, Roman Emperor from 161 to 180 AD, recording his private notes to himself and ideas on Stoic philosophy.
Marcus Aurelius wrote the 12 books of the Meditations in Koine Greek as a source for his own guidance and self-improvement. It is possible that large portions of the work were written at Sirmium, where he spent much time planning military campaigns from 170 to 180. Some of it was written while he was positioned at Aquincum on campaign in Pannonia, because internal notes tell us that the first book was written when he was campaigning against the Quadi on the river Granova and the second book was written at Carnuntum.
One of the key works on Stoicism is Marcus Aurelius' Meditations, published during his reign as Roman emperor. In Meditations, Aurelius expresses his views on the superiority of reasoning over passion and offers advice on how to begin molding your mind to think logically. You can live a meaningful life and pass away with grace by adhering to the Stoic philosophy.
You have power over your mind - not outside events. Realize this, and you will find strength.