What is the kingdom of God?

Today, in church, Pastor Lawrence was preaching and this is what learn from him

Matthew 6:31-33 (NKJV)

³¹ “Therefore do not worry, saying, ‘What shall we eat?’ or ‘What shall we drink?’ or ‘What shall we wear?’ ³² For after all these things the Gentiles seek. For your heavenly Father knows that you need all these things. ³³ But seek first the kingdom of God and His righteousness, and all these things shall be added to you.

And what is the kingdom of God? It is written in

Roman 14;17 (NKJV)

¹⁷ for the kingdom of God is not eating and drinking, but righteousness and peace and joy in the Holy Spirit.