What is the difference between the words expressed by the Lord Jesus in the Age of Grace and the words expressed by Almighty God in the Age of Kingdom?

Bible Verses for Reference:

“Repent: for the kingdom of heaven is at hand” (Mat: 4:17).

“And that repentance and remission of sins should be preached in his name among all nations, beginning at Jerusalem” (Luk 24:47).

“And if any man hear my words, and believe not, I judge him not: for I came not to judge the world, but to save the world. He that rejects me, and receives not my words, has one that judges him: the word that I have spoken, the same shall judge him in the last day” (Jhn 12:47-48).

“For the time is come that judgment must begin at the house of God” (1Pe 4:17).