When we come in the house of God we should go out changed by His presence. Ezekial saw a vision of the temple, and God gave specific directions for how people were to enter and exit. If they came in the north door they were to leave out the south. If they came in the south they were to leave out the north. Although it was an actual literal system they were to follow, the parralell to our spiritual life fits the model well. When we come to worship, we should leave the place changed by God’s power.