Liturgy and prayers have changed many times throughout the ages.
That is true. There are a diversity of Rites in the Church that express the Liturgy in different ways. They are all reflections of the Heavenly Liturgy. There is cross-pollination -- the
Kyrie was originally from the East (Jerusalem, IIRC) and then adopted in the West (and for a time, I understand, it was in Latin in the West instead of Greek). In what we call the traditional (<1970) Roman Rite, many of the flourishes in the prayers comes from the Gallican liturgy (the French always had to make everything fancy...) whereas the earlier Roman Rite was much more barren and straight-forward.
So yes, there are a diversity of
expressions of the
same Liturgy, of the
same Faith. The theology behind the Liturgy
must remain the same, even when the Liturgy changes naturally (organic development). There are better and worse expressions of the
same Faith, as greater or lesser importance is placed on the Liturgy and parts get expressed more clearly and more beautifully or fall into disuse and end up vestiges. But Liturgy is, in its essence, not something that can be changed by decree. When it does, as it has periodically, even slight changes have caused serious controversy until it can be proven that it expresses the same faith as before the change but just in a better way.
This reflects the fact that humankind grows in revelation and understanding of God
You are bordering on heresy here so watch your step. Your sentence can be read in an orthodox fashion, that we grow in our understanding of revelation; or it can be read in a heretical fashion, that God reveals more and more as time goes on or even contradicts what has been taught before. Public revelation is something that ended with the death of the last Apostle, St. John. The Deposit of Faith is
closed.
Nothing can be added or taken away from this Deposit. We are simply to transmit it from one generation to another.
2Th 2:14 said:
Therefore, brethren, stand fast; and hold the traditions which you have learned, whether by word, or by our epistle.
Jud 1:3b said:
...contend earnestly for the faith once delivered to the saints.
It is true that we slowly grow in our
understanding of this truth. For example, I am currently in a discussion on Christology and the development of the early Church Councils (esp. Ephesus and Chalcedon) in an effort against a sort of crypto-neo-Nestorianism. The
words we use to describe the Trinity and Christ
evolved, that does
not mean that the Truth of the Trinity or of Christ evolved. The Truth was already there, already given to us, it was already contained within the Deposit of Faith, it just had to be made clear by scraping off the barnacles of heresy and confusion.
(and also the fact that each generation has its own wonderful testimony of God's work in their lives).
Which is personal and private and unrelated to the Liturgy, which is part of the public faith and the foundation of our religion. Private revelation and experience can be very helpful to individuals, I have learned much from the spiritual experiences of the saints, but they are not on the same level as the Bible or the Liturgy.
And the Holy Spirit is moving on many Christians, both Catholic and non-Catholic, to an increased understanding of God's heart of love towards the Jewish people--and of how we can be better conduits of that love.
Exactly --
by converting them!
Rom 11:14-15 said:
If, by any means, I may provoke to emulation them who are my flesh [ie. Jews], and may save some of them. For if the loss of them be the reconciliation of the world, what shall the receiving of them be, but life from the dead?
...
The branches [Jews] were broken off .. because of unbelief....
...
See then the goodness and the severity of God: towards them indeed that are fallen, the severity; but towards thee, the goodness of God, if thou abide in goodness, otherwise thou also shalt be cut off. And they also, if they abide not still in unbelief, shall be grafted in: for God is able to graft them in again. For if thou wert cut out of the wild olive tree, which is natural to thee; and, contrary to nature, were grafted into the good olive tree; how much more shall they that are the natural branches, be grafted into their own olive tree? For I would not have you ignorant, brethren, of this mystery, (lest you should be wise in your own conceits), that blindness in part has happened in Israel, until the fulness of the Gentiles should come in. And so all Israel should be saved...
"All Israel" means "all of the elect" -- Jew and Gentile. St. Paul explained this earlier in the same epistle:
Rom 9:6-8 said:
Not as though the word of God hath miscarried. For all are not Israelites that are of Israel: Neither are all they that are the seed of Abraham, children; but in Isaac shall thy seed be called: That is to say, not they that are the children of the flesh, are the children of God; but they, that are the children of the promise, are accounted for the seed.
The Jews are blind, veiled from the Truth of Christ, and lost in darkness. It is our God-given duty to preach the Gospel to them and pray that they be converted to Christ and so be saved.
2Cor 3:14-16 said:
[T]heir [Jews'] senses were made dull. For, until this present day, the selfsame veil, in the reading of the old testament, remaineth not taken away (because in Christ it is made void). But even until this day, when Moses is read, the veil is upon their heart. But when they shall be converted to the Lord, the veil shall be taken away[/]
We show our love and concern by praying for the conversion of the Jews.
Good Friday Prayer for the Conversion of the Jews (my translation) said:
Let us pray also for the (disbelieving) Jews, that our God and Lord take away the veil from their heart; that also they [will] recognize Jesus Christ, our Lord.
(Priest: "Let us pray", Deacon: "Let us kneel", Subdeacon: "Arise")
All-powerful [and] everlasting God, who even now the (disbelieving) Jews your mercy does not turn away: hear our prayer, that for those people [their] blindness [shall be] removed; that [they may] realize your Truth and Light, who is Christ, [that] they [may be] delivered from darkness. Through the same our Lord Jesus Christ, your Son, who with Thee liveth and reigneth in the unity of the Holy Spirit, God; for ever and ever. Amen.
(The word "perfidis"/"perfidiam" (disbelieving, unfaithful) was removed in 1960 because its similarity to the much harsher English word "perfidy"/"perfidous" (treacherous, treasonous) was cause of scandal. Thus even a one-word change requires a serious issue and no change of the underlying theology.)