When a mind recognizes love drawing near, everything in it turns to greet the same arrival. The crowds before and behind are not two groups but the many thoughts a mind holds, all at once acknowledging the one Teacher they had forgotten they were waiting for. To cry that he comes in the name of the Lord is to admit that what approaches was never sent by fear, and that the strength entering the gate belongs to God and not to the ego's small defenses.
The welcome is loud because the recognition is total. A mind that has spent its days praising what threatens it now praises what saves it, and finds that the two teachers cannot be honored together. Whichever one it greets is the one it will follow into the city.
Multitudes: the countless thoughts within a single mind, moving together the moment it changes its allegiance.
Son of David: love arriving in a form the mind can recognize, the awakened self that comes bearing no threat.
City: the place in the mind the Teacher is welcomed into, the whole self opened to receive Him.