A short Plutarch essay arguing that parental love (philostorgia) is a natural instinct implanted by nature in all animals, not a calculated exchange for future support.
De Amore Prolis ("On Affection for Offspring") is a brief essay from Plutarch's Moralia that takes up a single question: is love for one's children natural, or is it a social contract dressed up as feeling, as Epicurus's line implied when it said people love "for pay"? Plutarch answers by touring the animal kingdom. He describes the halcyon's watertight, custom-fitted nest, the bear licking her shapeless cub into form, the partridge feigning injury to lure hunters away from her chicks, the hen spreading her wings over her brood, and the dog or sow that turns fierce or grieves when her young are threatened. None of these creatures acts from calculation, and none expects repayment; the behavior is present universally, immediately, and without instruction, which for Plutarch is the signature of nature rather than custom.
Having established that animals love their young for nothing, Plutarch turns to humans and argues the same instinct operates in us, only more fully, because reason extends it into justice, law, religion, and civic life. He walks through the physiology of pregnancy and lactation as evidence of a designed apparatus of care, then turns to the human newborn itself — helpless, unwashed, unlovely at birth — as proof that only an inborn love, not utility, could make a mother embrace it. He invokes the historical fathers of famous Greeks (Themistocles, Cimon, Pericles, Plato) who died before their sons' fame, and the childless rich who are courted by flatterers precisely because they have no heirs, to show that children bring parents burdens and dangers rather than advantage, so love for them cannot be explained by self-interest.
The essay closes by acknowledging that greed, vice, and poverty sometimes seem to override the instinct — the poor may forgo raising children to spare them a servile life — but Plutarch treats these as corruptions of nature, not evidence against it, comparing natural affection to gold still visible glinting through buried earth. The piece matters as a data point in ancient debates about nature versus custom (physis vs nomos) and as an early articulation of parental love as an evolved-seeming, non-transactional instinct, argued almost entirely from natural-historical observation rather than abstract philosophy.
“we go looking among horses and dogs and birds to learn how we ourselves ought to marry and beget and rear children”
— De Amore Prolis · read this chapter →
“And what is still more astonishing, the mouth of the nest is shaped so exactly to the size and measure of the halcyon that no other creature, whether larger or smaller, can enter it”
— De Amore Prolis · read this chapter →
“dogs do not love their puppies for pay, nor horses their foals, nor birds their nestlings, but freely and by nature”
— De Amore Prolis · read this chapter →
“there is nothing for anyone to touch, lift up, greet, and embrace except one who loves by nature”
— De Amore Prolis · read this chapter →
“nature, even amid these corrupted characters and passions, reveals its affection for offspring”
— De Amore Prolis · read this chapter →
It is a short essay arguing that love for one's children is a natural instinct built into all living things, not a calculated behavior aimed at future repayment. Plutarch supports this by surveying animal behavior — nesting, nursing, self-sacrifice for young — and then human physiology and history.
Epicurus reportedly held (per a line quoted in theaters) that people love each other "for pay," i.e., out of self-interest. Plutarch rejects this specifically for parental love, arguing that animals love their offspring with no possibility of reward, and that humans, if anything, suffer net cost and danger from rearing children, so the instinct cannot be transactional.
He describes the halcyon bird's precisely engineered nest, bears shaping their newborn cubs with their tongues, partridges risking capture to lure hunters from their chicks, hens spreading wings over their brood, and dogs or sows becoming distressed when their young are hurt or killed.
No. He argues that poor people who choose not to raise children do so out of love, fearing their children would live servile, uneducated lives in poverty — the underlying affection is still present but expressed as restraint rather than negated.
He notes that Neocles died before seeing his son Themistocles' victory at Salamis, and similarly for Miltiades/Cimon and Xanthippus/Pericles, to argue that parents typically never live to reap any benefit from their children's achievements, undercutting the idea that people have children for personal gain.
It is Latin for "On Affection for Offspring" (or "On the Love of Children"), the traditional title given to this piece from Plutarch's Moralia, a Greek essay collection covering ethics, natural philosophy, and social life.
Moralia: Ad Principem Ineruditum · Moralia: Adversus Colotem · Moralia: Amatoriae Narrationes · Moralia: Amatorius · Moralia: An Recte Dictum Sit Latenter Esse Vivendum · Moralia: An Seni Respublica Gerenda Sit · Moralia: An Virtus Doceri Possit · Moralia: An Vitiositas Ad Infelicitatem Sufficia · Moralia: Animine An Corporis Affectiones Sint Piores · Moralia: Apophthegmata Laconica · Moralia: Aquane An Ignis Sit Utilior · Moralia: Bruta Animalia Ratione Uti