How do we know God's kingdom is a kingdom of grace?

The kingdom of God is characterized as a kingdom of grace, illustrated in passages such as Mark 4:11, where Jesus indicates that understanding the mysteries of the kingdom is a divine gift. This grace is at the heart of God's sovereign will, revealing to 'babes' what is hidden from the wise. In Ephesians 1:9, Paul mentions that God has made known to us the mystery of His will according to His good pleasure. Thus, the understanding and entrance into this kingdom are solely initiated by God's will and mercy, affirming its nature as a kingdom of grace.