The Holy Bible, God's divinely revealed word to His creation, is compared to bread. The spiritually hungry should maintain a steady diet of it. It never gets stale.
Matthew 4:1-4 (NLT) Then Jesus was led by the Spirit into the wilderness to be tempted there by the devil. For forty days and forty nights he fasted and became very hungry. During that time the devil came and said to him, “If you are the Son of God, tell these stones to become loaves of bread.” But Jesus told him, “No! The Scriptures say, ‘People do not live by bread alone, but by every word that comes from the mouth of God.’ ”