prosoche

Prosochē is the closest thing the Stoics had to a name for their core practice. Literally "attention upon," it names the posture of continuous, evaluative attention that the practitioner maintains toward their own phantasiai, judgments, and assents. Epictetus treats it directly in Discourses 4.12 — On Attention.

It is often translated as Stoic mindfulness, but the comparison to popular secular mindfulness can mislead. Most popular secular mindfulness traditions are observational without judgment — you notice the impression without evaluating it. Stoic prosoche is precisely the opposite. The attention is evaluative — you are catching impressions in order to determine whether they deserve assent. The Stoic does not let the impression pass through; the Stoic interrogates it on arrival, deciding whether sunkatathesis is warranted.

Hadot calls prosochē the fundamental Stoic spiritual attitude. It is the disposition out of which every other exercise flows. The dichotomy of control, the view from above, the evening examen — all presuppose a practitioner who is paying continuous attention to their own mental life. Without that, the exercises become rituals performed at intervals; with it, they become extensions of an ongoing posture.

The practical consequence: most of the actual work of Stoic practice happens not during the formal exercises but in the gaps between them. The thirty seconds between a colleague's remark and your reply is where the discipline lives. Prosoche is the name for being awake in those gaps.