Symbol Analysis
The second major extended metaphor in the psalm is the analogy between the Lord and a host. A good host makes sure his guests have enough food and shelter, and that's what the Lord does, too. The roles of host and shepherd are similar in some ways. For example, in both cases, your responsibility is to take care of others, to keep them safe, happy, and healthy.
Also, both the host and shepherd are in some way superior to the people (or sheep) they're tending. The shepherd is a human, while the sheep are animals. And the host is the one who has the means to provide for the guest. In the same way, the Lord is in a superior position relative to humans. One important difference between the two roles: the shepherd belongs to a natural environment, and the host to a social one.
- Line 5: The analogy between the Lord and the host is implicit. That is to say, it isn't spelled out directly, but who else but a host would be serving meals? The image of a cup overflowing with liquid represents abundance.
- Line 6: The Lord's protection, generosity, hospitality, and _[insert other good qualities]_ are symbolized by the idea of being allowed to live in the Lord's house. The house itself is metaphorical.