The truly innosent are thoze who not only are guiltless themselfes, but who think others are.

[The truly innocent are those who not only are guiltless themselves, but who think others are.]

Josh Billings (1818-1885) American humorist, aphorist [pseud. of Henry Wheeler Shaw]

Everybody’s Friend, Or; Josh Billing’s Encyclopedia and Proverbial Philosophy of Wit and Humor, “Plum Pits” (1874)
    (Source)