It is wise to apply the oil of refined politeness to the mechanisms of friendship.
Quotes from Le Pur et l'Impur (The Pure and the Impure) — Colette
Attribution
Quotes and notes from Wikiquote: Colette (page history), available under CC BY-SA 4.0.
Quotes and notes from Wikiquote: Colette (page history), available under CC BY-SA 4.0.