Constitution of Vatican II on the Church. Solemnly promulgated by his Holiness Pope Paul VI on 21 November 1964
In eight chapters, we are told about the mystery of the Church. And the mystery of the Church came into being because God created us in His image and likeness and gathered us into Himself in the Old Testament through the gathering of the people. That was then given to us, again, in the person of Jesus Christ who gathered his disciples around the Kingdom of God – through His teaching and preaching
Lumen Gentium
Dogmatic Constitution on the Church – Vatican.va
Christ is the Light of nations. Because this is so, this Sacred Synod gathered together in the Holy Spirit eagerly desires, by proclaiming the Gospel to every creature, to bring the light of Christ to all men, a light brightly visible on the countenance of the Church. Since the Church is in Christ like a sacrament or as a sign and instrument both of a very closely knit union with God and of the unity of the whole human race, it desires now to unfold more fully to the faithful of the Church and to the whole world its own inner nature and universal mission. This it intends to do following faithfully the teaching of previous councils. The present-day conditions of the world add greater urgency to this work of the Church so that all men, joined more closely today by various social, technical and cultural ties, might also attain fuller unity in Christ.
A more in-depth look at Lumen Gentium
Dei Verbum
Dogmatic Constitution on Divine Revelation
Lumen Gentium
Dogmatic Constitution on the Church
Sacrosanctum Concilium
Dogmatic Constitution on the Sacred Liturgy
Gaudium et Spes
Pastoral Constitution on the Church in the Modern World