From the first letter to Serapion by Saint Athanasius, bishop
(Ep. 1 ad Serapionem 28-30: PG 26, 594-95. 599)
It will not be out of place to consider the ancient tradition, teaching and faith of the Catholic Church, which was revealed by the Lord, proclaimed by the apostles and guarded by the fathers. For upon this faith the Church is built, and if anyone were to lapse from it, he would no longer be a Christian either in fact or in name.
We acknowledge the Trinity, holy and perfect, to consist of the Father, the Son and the Holy Spirit. In this Trinity there is no intrusion of any alien element or of anything from outside, nor is the Trinity a blend of creative and created being. It is a wholly creative and energizing reality, self-consistent and undivided in its active power, for the Father makes all things through the Word and in the Holy Spirit, and in this way the unity of the holy Trinity is preserved. Accordingly, in the Church, one God is preached, one God who is above all things and through all things and in all things. God is above all things as Father, for he is principle and source; he is through all things through the Word; and he is in all things in the Holy Spirit.
Writing to the Corinthians about spiritual matters, Paul traces all reality back to one God, the Father, saying: Now there are varieties of gifts, but the same Spirit; and varieties of service, but the same Lord; and there are varieties of working, but it is the same God who inspires them all in everyone.
Even the gifts that the Spirit dispenses to individuals are given by the Father through the Word. For all that belongs to the Father belongs also to the Son, and so the graces given by the Son in the Spirit are true gifts of the Father. Similarly, when the Spirit dwells in us, the Word who bestows the Spirit is in us too, and the Father is present in the Word. This is the meaning of the text: My Father and I will come to him and make our home with him. For where the light is, there also is the radiance; and where the radiance is, there too are its power and its resplendent grace.
This is also Paul’s teaching in his second letter to the Corinthians: The grace of our Lord Jesus Christ and the love of God and the fellowship of the Holy Spirit be with you all. For grace and the gift of the Trinity are given by the Father through the Son in the Holy Spirit. Just as grace is given from the Father through the Son, so there could be no communication of the gift to us except in the Holy Spirit. But when we share in the Spirit, we possess the love of the Father, the grace of the Son and the fellowship of the Spirit himself.
ARISE! LET US BE GOING! 
” It is like saying that what Peter holds to be true on Earth is so in Heaven, instead of the other way around.”
Because Peter is doing the “holding” rather than conforming.
“Peter is doing the ‘holding’ rather than conforming”.
But now the opposite seems to be happening. Pope Francis appears to be conforming to the world rather than holding back apostasy.
That is what I see, too.
007, since we seem to be thinking along the same lines, may I ask if you think 2 Thessalonians 2:7 might be describing the role of St Peter and his successors as holding back apostasy / anti-Church / anti-Christ and that holding back will come to an end when the line of succession from Peter is broken somehow (the election of an anti-Pope)? Or maybe, the one holding it back is Our Lord Himself? His Sacrifice on the Cross perpetuated down the generations upon our altars and His Presence with us in Person lost if the Sacrifice of the Mass is somehow discontinued world-wide, which partially happened during the Covid-19 pandemic. “For the secret power of lawlessness is already at work; but the one who now holds it back will continue to do so till he is taken out of the way”.
“Or maybe, the one holding it back is Our Lord Himself? ”
Bingo! Father has me convinced that the Holy Fathers – all of them – are totally dispensable, and should be even more afraid than they seem to be because so much is given to them and expected of them (required?)!
“We acknowledge the Trinity, holy and perfect,”
What a perfect word; “acknowledge.”
I have heard theologians say “we believe,” “we hold to be true,” and other manners of speaking, which, to me fall, short – in that it seems to suggest that we sinners are making an appeal to our own authority. It is like saying that what Peter holds to be true on Earth is so in Heaven, instead of the other way around.
But what do I know?