In Brief CCC 567
© Libreria Editrice Vaticana Source: vatican.va
The kingdom of heaven was inaugurated on earth by Christ. "This kingdom shone out before men in the word, in the works and in the presence of Christ" (LG 5). the Church is the seed and beginning of this kingdom. Its keys are entrusted to Peter.
Read the full chapter 2. I Believe in Jesus Christ, the Only Son of God ¶422–682