A kingdom of life is a humble life. As you read through each of these attitudes, you find they point to one consistent theme. They call you to set aside yourself and what matters to you here, for the blessings and rewards that come from above. (See Matthew 5:12)
Oswald Sanders, in his book, Shoe-Leather Commitment, wrote while defining the ideal disciple by the Beatitudes,
Many think that if they had abundant wealth, absence of sorrow and suffering, good health, a good job, unrestricted gratification of appetites, and kind treatment from everyone, that would be blessedness indeed. But Jesus completely reversed that concept and substituted many of the experiences we would like to sidestep—poverty, mourning, hunger, thirst, renunciation, persecution. True blessedness is to found along this path, He told them.[i]
The rewards of the kingdom are found along the path of humility. The blessings come by the pursuit of the way of the old-rugged cross. Charles Spurgeon is attributed to saying,
Hide not the offense of the cross, lest you make it of none effect. The angels and corners of the gospel are its strength: to pare them off is to deprive it of power. Toning down is not the increase of strength, but the death of it.[ii]
[i] Sanders, J. Oswald. (1990). Shoe-Leather Commitment: Guidelines for Disciples. (pg. 12). The Moody Bible Institute. Chicago, IL USA.
[ii] Citing C.H. Spurgeon. McCraken, Brett. (2017). Uncomfortable. (pg. 44). Crossway. Wheaton, Illinios USA.