Joel 2: 12-13, 28 and Romans 2:4, Acts 2

The Lord spoke to Joel about an invasion or battle that would have happened had the people of Judah not repented with their complete hearts. We ought to repent sincerely so that God's rich compassion abounds in us freely. Don't repent with lip service but from within. God is so compassionate that his kindness leads us to repentance, as it says in Romans.

Joel predicted the outpouring of God's Spirit on mankind, and it was fulfilled in Acts, in the upper room. So, not just the special people with a specific duty like David or a priest, but all who came to him. Thus, if you desire to learn and pray more to God, you can have his Spirit ready to help you do these things. He is gracious to us, for he provided a Helper and Counselor to help us walk this life.