Matthew 4:4 CSB
He answered, "It is written: Man must not live on bread alone but on every word that comes from the mouth of God."
Jesus was making clear that while our nature is all about self (eating and physical things), we must consume and live on every word from God.
God has blessed us with His written Word so that we may consume it and live on it in an evil world.
I appreciate that God has revealed His Word through our Savior Jesus Christ and the Bible which has supernaturally recorded His Words via His followers.