Corn, wine, and oil, Oh my!

On page 212, Book 9, Chapter 4, St. Augustine is talking about vanity. Then, at the end of the chapter, he says, "For in your eternal simplicity I would possess other 'corn, and wine, and oil.'"

The footnote at the end of this quote directed me to Psalms 4:8, which is, "I will both lay me down in peace, and sleep: for thou, LORD, only makest me dwell in safety."

I am rather confused. How does Psalms 4:8 realte to "corn, and wine, and oil?"

~Hannah