Matteo 5:3

His first words strike the key-note of the entire discourse: Blessed are the poor in spirit; for theirs is the kingdom of heaven.

The reference of Jesus here is not primarily to temporal poverty, to earthly misery, as in other passages of the New Testament, 1 Corinthians 1:26-28; James 2:5. He is speaking of the poor and miserable "in spirit," those that shrink and cower with fear and dread, that are tremblingly alive to the wants and needs of their soul, that feel in their own heart, so far as spiritual riches are concerned, nothing but a great void, a despair of their own abilities, Matthew 11:5-28; Isaiah 61:1; Isaiah 62:2; Psalms 70:5.

Such as these, who are conscious, painfully aware, of their moral deficiencies, the Lord calls blessed, happy. If they were still under the mistaken impression that they were spiritually rich and wanted nothing, they might deceive themselves into a false security which would prevent their gaining the true riches, the only abiding happiness. But as conditions are, no false pride will keep them from accepting the unsearchable riches of the kingdom of heaven, which are theirs by grace.

For the kingdom of heaven is the sum total of all the gifts of God in Christ Jesus as they are enjoyed here on earth in the Christian Church and finally above, in the kingdom of glory. This being true, and the riches of the kingdom being even now in their possession, the disciples should strive all the more diligently to cultivate the poverty which the Lord here praises, and to exercise themselves in it daily.