In fact, heaven invades earth at every Eucharistic celebration ... in persona Christi. This is why the Church taught at Vatican II (Ibid, #7), "Christ is always present in His Church, especially ...

Catechism of the Catholic Church, 184. I believe in God, the Father almighty, creator of heaven and earth, and in Jesus Christ, his only Son, our Lord, who was conceived by the Holy Spirit and ...