Jesus gave the two "Great Commandment" when He was asked to identify the most important of God's commands. He said, "You shall love the Lord your God with all your heart, with all your soul, and with all your mind." This is the greatest commandment and the first commandment.
The secomd is like it. "You shall love your neighbor as yourself." The whole law and the prophets depend on these two commandments. Mt. 22: 36-40
Later, as Jesus said good bye to His disciples, He gave them a Great Commission that included three more tasks: "Go and make disciples of all nations, baptizing them in the name of the Father, and of the Son, and of the Holy Spirit, and teaching them to obey everything I have commanded you. Mt. 28:9-10
These two passages, the Great Commandment and the Great Commission, combine to create the essential purposes of the Lord's Vineyard spirituality and way of Catholic Christian community life through Worhsip, Fellowship, Discipleship, Minsitry, and Mission.