Then He opened His mouth and taught them, saying: “Blessed are the poor in spirit, for theirs is the kingdom of heaven. Blessed are those who mourn, for they shall be comforted. Blessed are the meek, for they shall inherit the earth. Blessed are those who hunger and thirst for righteousness, for they shall be filled. Blessed are the merciful, for they shall obtain mercy. Blessed are the pure in heart, for they shall see God. Blessed are the peacemakers, for they shall be called sons of God. Blessed are those who are persecuted for righteousness’ sake, for theirs is the kingdom of heaven. Blessed are you when they revile and persecute you, and say all kinds of evil against you falsely for My sake. (Matthew 5:3-11)
Scripture scholar Dale Allison offers some insight into understanding the Beatitudes:
In [Matthew] 5: 3-12 Jesus blesses believers because of what lies in store for them. This explains the future tenses – ‘will be comforted,’ ‘will inherit the earth,’ ‘will be filled,’ ‘will receive mercy.’ We have here not commonsense wisdom born of experience but eschatological promise which foresees the unprecedented: the evils of the present will be undone and the righteous will be confirmed with reward. The first part of each blessing describes the believers’ present, whereas the second half represents ‘anticipated eschatological verdicts’ (Betz):
Present condition — Future condition
poor in spirit — possess kingdom
mourn — obtain comfort
meek — inherit the earth
desire righteousness — obtain satisfaction
merciful — obtain mercy
pure in heart — see God
peacemakers — sons of God
persecuted — possess Kingdom
oppressed — great reward
The right-hand column in its entirety is a picture of the blessed future, which can be summarily characterized as experiencing in its fullness ‘the Kingdom of heaven.’ (THE SERMON ON THE MOUNT, p 42)
The Greek word (makarios) is a way of expressing a good fortune which, because it is known, brings joy. ‘Fortunate are the poor in spirit’ would be as accurate a translation as ‘Blessed are the poor in spirit’ or ‘Happy are the poor in spirit.’ (Dale Allison, THE SERMON ON THE MOUNT, p 43)
The key to mourning is probably to be found in the scriptural allusion. As observed above on page 16, 5:4 draws upon Isaiah 61:2: ‘to proclaim the year of the Lord’s favor, and the day of vengeance of our God: to comfort all who mourn.‘ In the Isaiah passage Israel is oppressed at the hands of its heathen captors; its cities are in ruins; its people know shame and dishonor. So God’s own are on the bottom, their enemies on top. Mourning is heard because the righteous suffer, the wicked prosper, and God has not yet righted the situation (cf. Revelation 6:9-11). It is the same in the Sermon on the Mount. The kingdom has not yet fully come. The saints are reviled and persecuted (5:10-12). The meek have not yet inherited the earth (5:5). The righteous still have enemies (5:43-48) who misuse them (5: 38-42). In short, God’s will is not yet done on earth as it is in heaven (6:10), and that can only mean mourning for God’s people. To those who understand the truth about the present age, grief cannot be eliminated.
‘Blessed are the meek‘ ‘contains an indirect summons to active deeds that fulfill the new law of Christ: active dedication to the high goal of meekness, friendliness, and gentleness – deeds that are determined not by anger, brutality, or enmity, but entirely by goodness’…. (Dale Allison, THE SERMON ON THE MOUNT, p 47)