The Stoics were clear that the morning is the day's key lever. Marcus Aurelius opens Book 5 of the Meditations with what may be the most famous wake-up passage in history: 'At dawn, when you rise reluctantly, let this thought be present — I am rising to the work of a human being. Why then am I dissatisfied if I am going to do the things for which I exist and for which I was brought into the world?' The morning was not optional in Stoic practice. It was when you set the frame you would see the whole day through. Skip it, and you meet the day's first difficulty unready, like a soldier who walked into battle without checking his weapons. The Stoic morning routine was not a productivity trick. It was a kind of vaccine for the mind.
Epictetus was specific about what the morning preparation should contain. In the Discourses, he describes going over Stoic principles before you meet the first person of the day. The reason is practical: we are social creatures, constantly shaped by the moods, values, and agendas of the people around us. Unless you have deliberately reinforced your own values before contact, other people's values will fill the gap. That is why Marcus, in his famous morning passage, names the difficult people ahead of time — the 'meddling, ungrateful, overbearing, treacherous, envious, antisocial' types he is sure to meet as emperor — and settles his response before they show up. He is not being negative. He is being prepared.
Seneca added the evening half of the Stoic practice. In his Letters, he describes a nightly ritual of looking himself over: 'When the light has been removed and my wife has fallen silent, aware of the habit that's now mine, I examine my entire day and go back over what I've done and said, hiding nothing from myself, passing nothing by.' The questions Seneca asked himself are early versions of what therapists now call a cognitive behavioral review. Where did I go wrong today? What did I do that was beneath my values? Where could I have been braver, more patient, more generous? The answers were not for beating himself up but for correcting course, the same way a good coach reviews game film. What happened, why it happened, and what would be better next time.