Place in the book. The fourth passage is a meditation on death — not as an evil but as a natural return to the elements. After the principle of action in 05-03, a contemplation of the end in the key of the discipline of desire: the acceptance of dissolution as part of the road κατὰ φύσιν.

"I go by nature until I fall." Πορεύομαι διὰ τῶν κατὰ φύσιν — "I go through what is according to nature," until I "fall and rest" (πεσὼν ἀναπαύσομαι). Life is conceived as a road DOGMAaccording to nature that has a natural end; the fall is not a catastrophe but a rest. Cf. 04-48: to pass "one's little time according to nature" and fall "like a ripe olive, blessing the earth that bore it."

The return to the elements. Death is analysed into two motions: to breathe out one's breath "into that from which I daily breathe in" (the air), and to fall "onto that from which" the body came (the earth). This is the Stoic physics of death: the composition and dissolution of the same elements (σύγκρισις/λύσις), a process κατὰ φύσιν and so not evil; and the return into what produced one — into the seminal reason of the Whole by transmutation. The breath returning into the air is also the pneuma dissolving into the cosmic air, the primal element.

Diminutives and "borrowed" matter. σπερμάτιον, αἱμάτιον, γαλάκτιον — "little seed," "little blood," "little milk": Marcus's characteristic depreciative diminutives. The "I" is reduced to borrowed matter — the father's seed, the mother's blood, the nurse's milk, the food and drink of so many years; all of it from the earth and owed back to the earth. This is the move of physical "definition" (reducing a thing to its material), which strips away the pathos of ownership over the body.

Gratitude to the earth. The close sounds a note of gratitude and humility: the earth "bears me as I tread on it and use it beyond measure" (εἰς τοσαῦτα ἀποχρώμενον). No complaint, no clinging — an acknowledgement of the debt to the nourishing element; cf. the olive "thanking the tree on which it grew" (04-48).

Discipline and parallels. The principal discipline is desire (the acceptance of death-as-dissolution as κατὰ φύσιν). The exercise is EXERCISEthe memory of death in its "physical" form. Parallels: Med. 4.5 (04-05); 4.14 (04-14); 4.48 (04-48).