These are the Stoic lines in this library, and only those. The four people are Marcus Aurelius, Seneca, Epictetus, and Zeno of Citium. Later admirers are not silently added. Each card is a paraphrase or a translation unless its badge says otherwise. None of these four is filed here with a Misattributed line. That is a fact about this library, not about every mug on sale.
The groups follow the words on the cards. Time is Seneca on wasting life, postponing, and living as long as one ought, plus Epictetus on giving a thing back rather than losing it. Death overlaps that group where the card is about a last act or ten thousand years. Discipline is practice: be one, the obstacle as the way, the headland, being thought foolish, refusing the name of philosopher, keeping on learning, living in agreement with nature, and the two ears. Anger is delay, not becoming like the person who injured you, and the judgement that a blow is an insult. Anxiety is imagination, judgements, wishing events to be as they are, the inner retreat, and the morning preparation.
Zeno’s cards are reports, and Diogenes Laertius and Stobaeus are named on them. Marcus’s cards are all from Meditations, and they have their own hub. Seneca on time has another. Epictetus’s short cards are from the Enchiridion, which the citations already say. A sentence can sit in two groups when the card really is about both. Nothing below is a statistic, and nothing is a claim that this is the whole school.