Anciently, that’s the key word here. Anciently, as in before Christ came to fulfill the law. Everything that was done in the OT was a prefigurement of Christ, it was set down by God in anticipation of Him, the Israelites were a people set apart in order to prepare the coming of the Messiah. And to even be a priest in the Temple, one had to be from the tribe of Levite, there were indeed laws and rules enforced for worthiness b/c Christ had *not come yet *to take away our sins, no matter how many offerings were made, they didn’t atone for all our sins for forever, the Israelites were not made permanently clean in their sacrifices which is why they had to make them all the time.
The very Ark of the Covenant was a prefigurement of Christ b/c it contained, the manna which pointed towards Christ as the Bread come down from Heaven. Second, it contained the priestly rod of Aaron which pointed to Christ as our eternal High Priest and thirdly, the Ark contained the Ten Commandments which pointed to Christ as the Word of God, come to us in flesh, not written in stone.
When Christ died, the curtain of the temple was torn in two, which symbolized that humanity was no longer exiled from Gods presence, b/c the veil itself symbolized our exile (as Adam and Even were exiled from the Garden b/c of sin). Only the High Priest could enter the Holy of Holies, and at that, just once a year. And then Jesus came, the very Word of God came to us and died for us, that we might be *set free *from sin and come to God. Christ atoned for our sins so that we may *no longer be separated *from God. We do not need this same pattern of “worthiness” anymore, Christ has made us worthy already, but it’s up to us now to accept his grace and mercy. The OT laws and rituals are obsolete, no longer necessary, Christ has perfected them.
Unfortunately, many people receive communion when they shouldn’t b/c they don’t understand the importance of what they’re receiving. Paul gave us a warning about this, but no one checks to see the state of our souls when we receive. Practicing Catholics, and those who understand the importance, know when they can accept and when we should refrain, but many don’t understand and take communion for granted.
The Sacraments are ways in which we can receive special graces from God. All seven of them were taught by the Apostles and by Christ, they were not invented by humans and they are not all considered necessary for our salvation (not every male becomes a priest, not every lay person marries etc.). Christ is our salvation, He is the way, the truth and the life. When we love Him, we participate in Him, with Him and through Him, through the sacraments of the Church.