"gather each day" - the bread of heaven meets a daily need. Every day we need the Word of God.
"the bread the LORD has given you" - the manna was a free gift, as was Christ. It was incomprehensible to them, as the natural man cannot understand the Word, 1 Corinthians 2:14. The manna was to be eaten. The Word of God must be meditated upon, and taken into the heart.