The anointing of the sick is administered to bring spiritual and even physical strength during an illness, especially near the time of death. It is most likely one of the last sacraments one will receive. A sacrament is an outward sign established by Jesus Christ to confer inward grace. In more basic terms, it is a rite that is performed to convey God’s grace to the recipient, through the power of the Holy Spirit.
When Jesus came, he elevated matrimony to the same status it had originally possessed between Adam and Eve—the status of a sacrament. Thus, any valid marriage between two baptized people is a sacramental marriage and, once consummated, cannot be dissolved. Jesus, therefore, taught that if anyone so married divorces and remarries, that person is living in perpetual adultery, a state of mortal sin.
"Where the bishop is, there is the community, even as where Christ is, there is the Catholic Church."
~ Ignatius of Antioch (Smyrn., viii, 2) circa A.D. 110, laid down this principle on true union with the Church, versus schism; all the more impressive because his casual use of the word "Catholic" demonstrates the widespread acceptance of the term at a very early date.