“It is not the healthy who need a doctor, but the sick. I have not come to call the righteous, but sinners.” (Mark 2:16-17). When we read Luke 18:10-17, it talks about the pharisee and the tax collector. The pharisee thought he's done much to merit the blessings of God. But the tax collector saw himself as a sinner who didn't even merit the blessing of God. God rather conmended the tax collector. Blessed are the poor in spirit means that God blesses those who know they cannot make it without God. They don't rely on their own strength or riches bcos they believe all that they have or they are is just by the grace of God and nothing else. We are all sinners saved by God's grace!