"Sometimes people are very explicit about the fact that what they have to say is worth paying attention to. The 15th- and 16th-century philosopher Francis Bacon had his publisher print, on the front of one of his works, the following words: Francis of Verulam reasoned thus with himself, and judged it to be for the interest of the present and future generations that they should be made aware of his thoughts. To be so explicit about the fact that the audience should pay attention was perhaps somewhat immodest, but what Relevance Theory tells us is that we all do this, every time we speak."
From Thom Scott-Phillips' excellent Speaking Our Minds, pg. 61.