Pretty much all the honest truth-telling there is in the world is done by children.

A paraphrase of Oliver Wendell Holmes, Sr., in "The Poet at the Breakfast-Table" in The Atlantic Monthly Vol. 29 (1872), p. 231: "I like children, — he said to me one day at table. — I like 'em, and I respect 'em. Pretty much all the honest truth-telling there is in the world is done by them".