A statement that seems to contradict itself or common sense, but that, once thought through, reveals a truth.
In Dom Casmurro
she concealing with words what I published through silence
"Publishing through silence" sounds like a contradiction, since whoever keeps silent publishes nothing; the phrase says, however, that Bentinho's silence reveals more than any speech would.
Chapters XXIII to XXXIV: The Gypsy Eyes and the Eyes of Undertow, the narrator