When Jesus, who had suffered the death of the cross for mankind, had risen, He appeared as the one constituted as Lord, Christ and eternal Priest, and He poured out on His disciples the Spirit promised by the Father. From this source the Church, equipped with the gifts of its Founder and faithfully guarding His precepts of charity, humility and self-sacrifice, receives the mission to proclaim and to spread among all peoples the Kingdom of Christ and of God and to be, on earth, the initial budding forth of that kingdom. While it slowly grows, the Church strains toward the completed Kingdom and, with all its strength, hopes and desires to be united in glory with its King.
All Christians in any state or walk of life are called to the fullness of Christian life and to the perfection of charity. ... In order to reach this perfection the faithful should use the strength dealt out to them by Christ's gift, so that ... doing the will of the Father in everything, they may wholeheartedly devote themselves to the glory of God and to the service of their neighbor.