“Beatitude” is a transliteration of the Greek word beatus, it is best translated blessed. So in essence we should call these "The Blessings" rather than "The Beatitudes."
This idea of being poor in spirit develops from the OT when God’s people were known as “The poor of the Lord.” Some of the various Hebrew words translated as poor can also mean “lowly” or “humble”. This gives us a glimpse into what “poor in spirit” is actually referring to.
Verse 4: Blessed are those who mourn, for they will be comforted.
This idea of being blessed for mourning seems strange. This however does not mean those who are always upset are blessed, nor does it mean to enter the
Verse Five: Blessed are the meek, for they will inherit the earth.
Poverty of spirit has to do with ones personal assessment of himself, where meekness has to do with a relationship with God and men.
Martyn Lloyd Jones says meekness does not mean indolence, flabbiness, niceness or easy to get along with. Those are natural qualities; a dog can be nicer than another dog. Meekness is not something that is naturally attainable; it is only available through the spirit. We may think someone is meek because they are nice to others, but there inner desire may be for selfish gain. Meekness is not weakness. A meek man will die for the truth if necessary. The martyrs were meek, but they were by no means weak. A weak pushover cannot be meek, for meekness involves control over ones self.
Verse Six: Blessed are those who hunger and thirst for righteousness, for they will be filled.
Many in our current Christian world do not hunger and thirst for righteousness. They may want to know how to live a purpose driven life or how to live their best life now. Many want to know the most effective way to evangelize or what worship style is best. And many more jump from church to church, conference to conference wanting to experience some kind of spiritual high, but few thirst for righteousness. The man who is marked by poverty of spirit, who grieves over personal sin, and who lives in meekness, must also hunger and thirst for righteousness. It is not that the man, is looking for the next step for becoming a better Christian, but the change in his life from living like Christ has produced a hunger for righteousness, that he cannot imagine living without. This is the man who is not just sorry he got caught sinning, but whose sin utterly breaks his heart, and is begging God to help him conquer his sin.