The expression "Barkis is willing" first appeared in Charles Dickens' well-known classic "David Copperfield". Barkis is the name of one the characters in the novel. He keeps sending a message through David to Clara Peggotty, the maid of David's mother. The message that David is to give Clara is "Barkis is willing". In other words, Barkis is willing to marry Clara. The expression is used nowadays to indicate one's willingness or readiness to do something.

David Copperfield is the common name of the eighth novel by Charles Dickens, first published as a novel in 1850. Its full title is The Personal History, Adventures, Experience and Observation of David Copperfield the Younger of Blunderstone Rookery (Which He Never Meant to Publish on Any Account). Like most of his works, it originally appeared in serial form during the two preceding years. Many elements of the novel follow events in Dickens' own life, and it is probably the most autobiographical of his novels. In the preface to the 1867 edition, Dickens wrote, "like many fond parents, I have in my heart of hearts a favourite child. And his name is David Copperfield