The buddha of the human realm is a buddha with a begging bowl. This represents the mentality of poverty, which is the largest concern of the human realm. In order to relate with poverty, you have to speak the language of poverty. But by carrying a begging bowl, in fact, it is as though you always have something to put things into. In other words, the ultimate mentality of poverty is also the mentality of richness at the same time. Whatever situations need to be created, you can create them, and you get it. You are in command of the whole situation. So that is being extremely wealthy.
From "The Human Realm," in TRANSCENDING MADNESS: THE EXPERIENCE OF THE SIX BARDOS, page 247.