Blessed are the poor in spirit: for theirs is the kingdom of heaven.
Matthew 5:3 (KJV)
Poor in spirit means to live in complete dependence upon God. Rather than relying upon our own strength and self effort, we continuously look to Him for everything. We follow His guidance and direction in all things. Jesus is telling us that those who depend upon Him will see the rich and abundant blessings of the kingdom of God made manifest in their lives.