Ὑπομνήματα means literally "things that serve to remind" (from ὑπομιμνήσκω, "to remind"). In antiquity the word covered a wide range of written forms: administrative memoranda, students' notes taken from a lecturer, personal collections of excerpts, working drafts toward a composition. What they share is that they are instrumental: such a text is not meant for a reader, it is a tool for the one who keeps it.

For Stoic practice the personal variety is what matters: notes written to and for oneself, to keep the teachings in working order. This is not a diary — there is no confession, no chronicle of events, no development of an "inner life"; and not a treatise — there is no addressee, no exposition, no proof offered to another. The note runs an already familiar proposition through once more, because knowing a teaching and having it ready to hand are two different things.

Hence a consequence for reading: repetitiveness is not a defect of composition but the method. The same thoughts returning in different formulations are not editorial carelessness but the work itself: the teaching is rewritten until it becomes one's own.

Relation to neighbouring cards: πρόχειρον is the state aimed at (the teaching ready to hand), ὑπομνήματα the means by which that state is maintained; parakolouthesis tracks the movements of the soul, ὑπομνήματα fix the result in writing.

(1) Write the teaching down compactly — short enough to be taken in at a glance; a developed proof is out of place here, it has been done elsewhere. (2) Address yourself in the second person — an imperative or a question, not a statement: not "the sage does not grow angry" but "do not grow angry." (3) Return to the same thought without fearing repetition: the aim is not to enlarge the collection but to inscribe it again. (4) Do not reckon on a reader — neither a contemporary nor a posterity: the moment an addressee appears, the genre topples over into a treatise or a memoir. (5) Keep the notes physically about you — hence the link with πρόχειρον.