"If I were hungry, I would not tell you,
for the world and its fullness are mine.
Do I eat the flesh of bulls
or drink the blood of goats?
Offer to God a sacrifice of thanksgiving,
and perform your vows to the Most High,
and call upon me in the day of trouble;
I will deliver you, and you shall glorify me."
I think this is such a vivid way of describing God's desire for worship - but that the instructions he gives are not because that is what he needs. Instead, as our Creator, he teaches us how we were designed to interact with him so that we can be fulfilled in our relationship with him.