This sounds like satire to me. the speaker is, in a way, mocking those who disregard their own ignorance in situations to answer or quote something that they believe to be true, but is actually incorrect.
When we read the quote "…it is best one should quote what one doesn’t understand at all in the language one knows the least," we realize we are talking about satire.
This quote is from the great Voltaire. This quote appears in his book "Candice and Other Stories.," considered by the experts a classic satire novel. It was published in 1759. In the novel, Voltaire makes a parody of some elements of religion and politics. Voltaire (1694-1778), was one of the most important French writers during the Enlightenment. So yes, when we read the quote "…it is best one should quote what one doesn’t understand at all in the language one knows the least," we realize we are talking about satire.
