They shall speak of the glory of Your kingdomThey will glorify God, by talking about His power and mighty acts. The same root word appears twice in those verses, which means strength, might, valor, bravery, and especially the mighty deeds of God.
And talk of Your power;
To make known to the sons of men Your mighty acts
And the glory of the majesty of Your kingdom.
In the kingdom of heaven, actively glorifying God is more influential than preaching precepts. So our words and works should have more to do with praising and glorifying God(to reveal how amazing He is in the eyes and ears of others). Just as He is infinitely amazing.
The parables are mundane metaphors which illustrate the ways of the kingdom of heaven. But, without the illumination of God's glory, they are just stories. Just as Jesus seemed mundane to most people, but then Holy Spirit inspired Peter to proclaim, You are the Christ, the Son of the living God. Or just as Adam was inanimate before God breathed life into him. Also, Paul revealed how the saying of a philosopher actually reflected the truth of God: In him we live and move and have our being... But without the revelation of the Spirit of God, it was just Greek philosophy. So Father God is the One who breathes life into the whole earth.