In the Bible, Quran, Vedas, etc., there are many passages regarded by believers as direct quotes from a deity. Is there anything like this concerning Quetzalcoatl?
I asked this here last week, but instead of a "yes" or "no" all I got was some jackass who wanted to mockingly dangle his/her academic superiority over my head.
Instead of griping about it, consider that they know what they are talking about and were trying to be helpful. They could have answered your question directly, or course, but if you are interested in direct quotes from "the Mayan God Quetzalcoatal", it is important to know that Quetzalcoatl is not a Mayan deity, but an Aztec god. There are many feathered serpent deities in Mesoamerica, including Kukulkan and Quetzalcoatl, but they are not the same god even if they probably share similar origins and are otherwise quite similar. Would be like saying that all Eurasian male sky deities are the same god, from Zeus to Tengri.
I can't help with direct quotations from feathered serpent deities in Mesoamerica in general, but I can speak about the Maya deity Kukulkan.
To my knowledge there are no direct quotes from any Maya deities (including Kukulkan) except in the Popol Vuh (the creation story of the Maya). Kukulkan was a very late addition to Maya religion, probably being introduced from Central Mexico in the 9th century A.D. (when we have the earliest Maya depictions of feathered serpents). Even then, it doesn't appear that Kukulkan was ever a very important deity in Maya religion, and certainly not to the degree Quetzalcoatl (and other feathered serpent deities) were important in central Mexico.
That is not to say that there were no direct quotes from Kukulkan, but we don't have access to them (if they ever existed) since the majority of Maya religious literature (captured in books called codices) was lost when the Spanish burned and outlawed these books. Of the four remaining codices we have access to, Kukulkan only appears once (in the Dresden codex - note the serpent he is holding) and is named as a different deity all together (the flower god Nik).
Just generally, Mesoamerican deities usually do not communicate directly with humans (like a Greek god would), so the lack of direct quotations is not surprising. Additionally, most literature we have (especially Mayan) is not in the form of narratives/stories where different deities would have lines of dialogue, the exception being the Popol Vuh. Most Maya writing involving deities is about gods, particularly their actions, and not about what they say.
Edit: For clarity about time.
You asked your question three days ago and I apologize for celebrating my nation's independence this weekend. Since that time I have not been able to find what you are looking for. If you want to draw upon mythologies about Quetzalcoatl I suggest going to your library and taking a look at the available Aztec codices. If they do not have them I am sure you can get copies of these books through interlibrary loan.