The cause is hidden, but the result is well known.
Causa latet, vis est notissima
Original text (Latin)
Notes from Wikiquote
Book IV, 287
Variants
The cause is hidden; the effect is visible to all.
Original text (Latin)
Quote text and notes from Wikiquote: Ovid (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.