Our Catholic faith is understood through two major building blocks: Scripture and Tradition. When Christ established the Church, He gave us these beautiful gifts so that we might grow ever closer to God and spread the Gospel to the whole world. He also gave us an additional gift that is a stark reminder of the fact that the Church is both living and trustworthy: apostolic succession.
Since God created the earth, marriage has been a part of His divine plan. Though the relationship between man and woman (and, therefore, marriage) was damaged by original sin, Jesus repaired this relationship and raised marriage to a sacrament. The Church recognizes marriage as a sacred institution that is not merely a personal decision, but a vocation.