Blessed (happy, to be envied, and spiritually prosperous—with life-joy and satisfaction in God’s favor and salvation, regardless of their outward conditions) are the poor in spirit (the humble, who rate themselves insignificant), for theirs is the kingdom of heaven!
Poor in Spirit describes someone who is spiritually helpless, someone in desperate need of God. It's an absolute confession that I am nothing and can do nothing apart from Christ.
This verse, the first beatitude, keeps bringing to mind the song "Lord I Need You."
"Lord, I come, I confess