Summary
Section I gives Serenus’s account of his instability. He values thrift yet feels diminished after seeing luxury; he wishes to serve publicly yet retreats when administration becomes frustrating; and he resolves to write simply before elevated thought revives ambition. He asks Seneca for a remedy to a discomfort more like seasickness than a storm.
Section II names the desired condition as peace of mind. Seneca compares Serenus to someone recovered from illness who still mistrusts health. The wider disease is dissatisfaction with oneself, expressed through changing plans, frustrated desire, idleness and restless attempts to escape one’s own company.
Section III recommends fixing the mind upon a sound course while allowing practical adaptation. Purpose must be stable even when circumstances alter the form of action. Useful occupation prevents leisure from degenerating into inertia.
Sections IV and V consider withdrawal from public affairs. Athenodorus’s preference for retirement is qualified: a person may still contribute under difficult conditions, and courageous involvement can be honourable even when success is unlikely. Historical examples illustrate steadfast service amid political danger.
Section VI advises examining the self before choosing a life. Temperament, strength and the demands of an undertaking should be compared honestly. Repeatedly attempting what exceeds one’s capacity produces discouragement and self-contempt.
Section VII turns to companions and activities. People who complain continually transmit their agitation, while trustworthy friends can share burdens and correct judgement. Undertakings should possess a definite end rather than merely occupy time.
Sections VIII and IX address property. Greater possessions require greater protection and expose the owner to more possible losses. Seneca praises a manageable sufficiency and recommends rehearsing simplicity so that poverty is neither unfamiliar nor terrifying.
Sections X and XI examine severe reversals. The imperfect person will still feel pain, but advance preparation prevents surprise from doubling it. Examples of people meeting condemnation, exile or death with composure show the freedom created by accepting mortality.
Section XII attacks empty busyness. People rush between houses, journeys and projects without a purpose capable of satisfying them. Their bodies change location while their discontent travels with them.
Sections XIII and XIV recommend adaptability and good humour. Plans should not be made so rigidly that minor interference becomes disaster. Other people’s faults should be met without excessive astonishment, since human error is neither new nor exceptional.
Section XV considers grief over public conditions. Constant attention to corruption and undeserved success can exhaust the observer. One should help where possible without allowing society’s madness to occupy the whole mind.
Section XVI warns against living for display. Concealment and pretence create anxiety because the person must constantly maintain an image. A simpler and more open life reduces fear of exposure while preserving appropriate privacy.
Section XVII concludes with rhythm and restoration. Solitude and society should alternate, and effort should be interrupted by recreation, open air, conversation and festivity. Rest renews capacity, but constant indulgence destroys it. Seneca ends by saying that every remedy requires unremitting watchfulness over the wavering mind.