Dreaming when Dawn’s left hand was in the Sky
I heard a Voice within the Tavern cry,
'Awake, my Little ones, and fill the Cup
Before Life’s Liquor in its Cup be dry.'

From the darkness of sleep Omar hears a voice, a message from his heart or spirit.

The tavern represents life as a whole, as well as the body. The tavern is your body, but your body is in life. The work on yourself is done in ordinary life and society, not by withdrawing from it.

The voice within the tavern is a cry from the heart. The little ones, the parts of yourself that are striving for something better, are told to wake up, join the battle, otherwise there will be no hope of winning. When you fill the cup, you are going to fulfil your potential, achieve everything you are capable of. You are going to see everything and fill up your life. It is a basic principle of the Work that you need to fill things up before you can empty them. Throughout your work on yourself, you are putting some things in and taking others out, inasmuch as you work against a negativity in yourself and replace it with something positive. If you wanted to you could fill your ego, or your idea of yourself, but throughout the poem, wine, or liquor, usually means the spirit. You are being exhorted to develop your spiritual potential.