Continued —>
One: the Church is unified, single and one; there are not two or three or more true Churches, for two contradictory things cannot both be true, and if we narrow it down to the most basic set of two Churches and they are different, then at least one of them must be wrong - which proves that there is only one true Church.
Holy: If Jesus specifically founded something (as is shown above) and He intended it (or her) to have the authority to act in His place on Earth, how could it not be holy? This is shown by the fact that Jesus is married to the Church (Ephesians 5:22-32, Revelation 19:7, 21:2), by the teaching that marriage makes man and wife one flesh, and by the constant references in Scripture that the Church is Jesus’ Christ’s mystical body. The Church is Jesus Christ’s body and is, therefore, holy (although individual members of the Church are not impeccable).
Catholic: “catholic” means universal – the Church established by Jesus Christ must be universal and be found everywhere. Because the Church also has to be one it has to be universal – there could not be national or geographically limited Churches because they would either teach different things, or they would – in fact – be one Church. The Catholic Church is the only Christian “denomination” in the world to not be split into geographically local groups and to have consistent theological teachings across all individual places of worship. She is also found on every continent and in virtually every country in the world, and is constantly expanding. Her membership is open to all and she has endured for nearly 2000 years. By anyone’s standard, that has to be considered universal.
Apostolic: the Church claims genuine descent from the apostles who were selected and chosen by Jesus Christ. Jesus desired to found a Church which would contain genuine priests who were capable of acting in His place to administer the ordinary means of salvation, the sacraments. Jesus chose men to be His apostles and gave them a special mission. The book of Acts (the story of the early Church) is full of examples of men being appointed to the office of priest by other priests (this is apostolic succession). Saint Paul says, very clearly, in Ephesians 2:20 that the Church is built on the foundation of the apostles and prophets. Clearly, therefore, Jesus wanted a Church which not only had a priesthood, but also a Church whose priesthood could claim legitimate descent from the apostles. Today, the only Church which has legitimate descent from the apostles is the Catholic Church.
Additionally, simple logic tells us that the Church which has authority, is visible, is apostolic and which was founded specifically by God as the ordinary means of salvation has to be perpetual.
Logically speaking, when it is shown that the Church must possess the four marks she does, that she possess authority and that she is perpetual it is completely necessary for her to be visible and identifiable! How else would people be able to find the Church if she were invisible?
I hope the above helps.