Proverbs 30 is written by a man named Agur (1).  He starts out with a self-rebuke because he had not acquired the wisdom and knowledge available to him (2-6).  The rest of the chapter consists of six numerical sayings (7-9, 15b-16, 18-19, 21-23, 24-28, 29-31).  In the verses under consideration, he desired to see two realities exist in his life before he died.  First, that vanity and lies would be far removed from him.  Second, to not have poverty or riches but enough to live on each day.  In other words he wanted to be content.