The Greek word translated “blessed” means "spiritual well-being and prosperity." This refers to the deep joy of the soul held by those who posses these attitudes. Those who experience the first aspect of a beatitude (poor in spirit, mourn, meek, hungry for righteousness, merciful, pure, peacemakers, and persecuted) will also experience the second aspect of the beatitude (kingdom of Heaven, comfort, inherit the earth, filled, mercy, see God, called sons of God, inherit the kingdom of Heaven). The blessed have a share in salvation and have entered the kingdom of God, experiencing a foretaste of heaven.
The Beatitudes describe the ideal disciple and their rewards, both present and future. The person whom Jesus describes in this passage has a different quality of character and lifestyle than those still "outside the kingdom." They are quite literally the blessed attitudes to hold and Christians believe how people should act in this life.
As a literary form, the beatitude is also found in the Old Testament, especially in the Psalms (1:1; 34:8; 65:4; 128:1) and in the New Testament as well (John 20:29;14:22;James 1:12;Revelation 14:13).