1 Corinthians 10:26
“For to the Lord belongs the earth and the fullness thereof.” Not to the devils. Now if the earth and the fruits and the beasts be all His, nothing is unclean: but it becomes unclean otherwise, from our intention and our disobedience. Wherefore he not only gave permission, but also,
Source: Homilies on First Corinthians (New Advent)