"Danged if ye bain’t altered now, malter," said a voice with the vigour natural to the enunciation of a remarkably evident truism.
"True, drink is a pleasant delight," said Jan, as one who repeated a truism so familiar to his brain that he hardly noticed its passage over his tongue; and, lifting the cup, Coggan tilted his head gradually backwards, with closed eyes, that his expectant soul might not be diverted for one instant from its bliss by irrelevant surroundings.
There are no more uses of "truism" in the book.
Show samples from other sources
But this truism requires some qualification.
James M. McPherson -- What They Fought For - 1861-1865
Though, indeed, the vendor of a certain nostrum has vulgarized the truism to the very point of contempt.