Melchizedek, priest of God Most High, offers a cup of blessing to God Most High and calls down a blessing upon Abraham. Until that time, sacrifices to the gods were always live animals or in some cases even human sacrifices.  Yet Melchizedek offers bread and wine to God Most High. This becomes a sign that these simple gifts are indeed worthy of God. It also becomes clear that these simple gifts can bestow upon us a blessing, for it is clear that Abraham was indeed richly blessed by God when this cup of blessing was offered to God.