Erasmus, Adagia §I.ii.50 (tr. Margaret Mann Phillips)

Fratrum inter se irae sunt acerbissimae

The bitterest quarrels are between brothers.

Erasmus, Adagia (tr. Margaret Mann Phillips). Published in Collected Works of Erasmus, Vol. 31.

Wisdom Lesson

This breve adage captures a phenomenon every culture recognizes: the closer the relationship, the sharper the conflict. Siblings, partners, near kin — those who share the most together and who know each other most fully — are also those who can inflict the deepest wounds. The Latin acerbissimae (most bitter) is carefully chosen: it is not merely sharp but maximally so, the superlative of acidity itself.

The observation runs through the wisdom literature. Proverbs 18:19 — A brother offended is more unyielding than a strong city — says much the same thing in biblical terms. The Lutherans at the Coburg in 1530 felt it too, as fellow emigrants split along lines of family and patronage through the long months of exile.

The logic is straightforward: those outside the family are handled with ceremony; those inside are handled with presumption. The outsider gets the polite distance that protects both parties. The insider gets the full weight of your honesty — and when that honesty turns to resentment, there is no buffer to absorb the blow. The closer the bond, the less the restraint, and the more the wound lands on bare flesh.

Erasmus leaves the remedy implicit, as good proverbs do. One must: choose the quarrels worth losing a brother over, or lose the brother over less than quarrels.

Language Lesson

Fratrum inter se irae sunt acerbissimae

Vocabulary

  • frater, -is (m.) — brother
  • inter se — between themselves, one another (reflexive)
  • ira, -ae (f.) — anger, wrath
  • sum, esse, fui, futurus — to be
  • acerbissimus, -a, -um — most bitter, sharpest (superlative of acerbus)
  • acerbus, -a, -um — bitter, harsh, sharp

Grammar

Fratrum inter se irae sunt acerbissimae — A complete sentence in the nominative: irae (nom. pl., wraths/quarrels) is the subject, acerbissimae (nom. pl., most bitter) is the predicate adjective. The verb is sunt (they are). Fratrum (gen. pl., of brothers) modifies irae — literally of brothers, wraths between themselves are most bitter.

The word inter takes the accusative, but here inter se is an adverbial phrase meaning between themselves — the quarrels that brothers have with one another. The reflexive se refers back to the brothers (fratrum).

The superlative acerbissimae is emphatic: not just bitter but the bitterest possible. Erasmus is saying these are not merely sharp words but the sharpest quarrels imaginable.

Erasmus, Desiderius. Adagia. In Collected Works of Erasmus, Vol. 31: Adagia I.i.1 to I.v.100, trans. Margaret Mann Phillips. Toronto: University of Toronto Press, 1982.