>Papal Supremacy
And again He says to him [Peter] after His resurrection: 'Feed my sheep' (John 21:17). On him He builds the Church, and to him He gives the command to feed the sheep; and although He assigns a like power to all the Apostles, yet He founded a single chair, and He established by His own authority a source and an intrinsic reason for that unity. Indeed, the others were that also which Peter was; but a primacy is given to Peter, whereby it is made clear that there is but one Church and one chair. So too, all our shepherds, and the flock is shown to be one, fed by all the Apostles in single-minded accord. If someone does not hold fast to this unity of Peter, can he imagine that he still holds the faith? If he desert the chair of Peter upon whom the Church was built, can he still be confident that his is in the Church?"
St. Cyprian of Carthage
>Papal Infallibility
“Although the catholic churches diffused throughout the world are one bridal chamber of Christ, yet the holy Roman church has been preferred to all other churches, not by any synodical decrees, but has obtained the primacy by the voice of our Lord and Savior in the gospel, saying: ‘You are Peter, and upon this rock I will build My church, and the gates of hell will never prevail against it; and I will give to you the keys of the kingdom of heaven, and whatever you bind on earth shall be bound in heaven, and whatever you loose on earth shall be loosed in heaven…..Therefore, the first see of Peter the Apostles is that of the Roman church, not having spot or wrinkle or any such thing
St. Damasus
>Filioque
"Concerning the Holy Spirit . . . it is not necessary to speak of him who must be acknowledged, who is from the Father and the Son, his sources"
St. Hilary of Poitiers
>Divine Simplicity
God is truly and absolutely simple.
St. Augustine
>Transubstantiation
We observe, then, that grace has more power than nature, and yet so far we have only spoken of the grace of a prophet's blessing. But if the blessing of man had such power as to change nature, what are we to say of that divine consecration where the very words of the Lord and Saviour operate? For that sacrament which you receive is made what it is by the word of Christ. But if the word of Elijah had such power as to bring down fire from heaven, shall not the word of Christ have power to change the nature of the elements? You read concerning the making of the whole world: "He spake and they were made, He commanded and they were created." Shall not the word of Christ, which was able to make out of nothing that which was not, be able to change things which already are into what they were not? For it is not less to give a new nature to things than to change them.
St. Ambrose
>Original Sin
If anyone asserts that Adam's sin affected him alone and not his descendants also, or at least if he declares that it is only the death of the body which is the punishment for sin, and not also that sin, which is the death of the soul, passed through one man to the whole human race, he does injustice to God and contradicts the Apostle, who says, "Therefore as sin came into the world through one man and death through sin, and so death spread to all men because all men sinned" (Rom. 5:12).
Council of Orange
>Immaculate Conception of Mary
And she was perplexed by this word; for she was inexperienced in all the addresses of men, and welcomed quiet, as the mother of prudence and purity; (yet) being a pure, and immaculate, and stainless image herself, she shrank not in terror from the angelic apparition, like most of the prophets, as indeed true virginity has a kind of affinity and equality with the angels
St. Gregory Thaumaturgus
>Created Grace
And thus grace is said to be created inasmuch as men are created with reference to it, i.e. are given a new being out of nothing, i.e. not from merits, according to Ephesians 2:10, "created in Jesus Christ in good works."
>Purgatory
If, then whether by forethought here, or by purgation hereafter, our soul becomes free from any emotional connection with the brute creation, there will be nothing to impede its contemplation of the Beautiful
St. Gregory of Nyssa