To be ‘poor in spirit’ means to be finally ‘empty’ of absurd illusions, to have achieved a Socrates-like humility and to recognize that we know nothing – for only God is wise. The ‘poor in spirit’ acknowledge their spiritual neediness.
Such people are ‘blessed’ because there is room now for Christ to enter their souls, there is room for the passionate longing of Eros to return — the longing for union with God. The door to the Threshold, the inner door that leads to the Kingdom of Heaven, can only open for those who have this longing.
“But woe to you who are rich”, Christ adds in Luke, for those who are ‘rich’ in spirit, who are filled with vanity and are content with the world of the ego, shadows, and illusions of self-importance, have already received their consolation.