Sometimes Protestant apologists try to bolster their case for sola Scriptura by using highly selective quotes from Church Fathers such as Athanasius, John Chrysostom, Cyril of Jerusalem, Augustine, and Basil Caesarea. ... These quotes, isolated from the rest of what the Father in question wrote about church authority, Tradition and Scripture, can give the appearance that these Fathers were hard-core Evangelicals who promoted an unvarnished sola Scriptura principle that would have done John Calvin proud.John Calvin would likely retort that Madrid is reversing the order - Calvin inherited his view of sola Scriptura in large part from his extensive study of patristics. It's certainly true that the "Church Fathers" were not Presbyterians or Reformed Baptists, but they did treat Scripture as being the only infallible writing they had. The accusations of isolation and selection are misleading at best. If one reads the works of Athanasius, one finds an almost constant appeal to the authority of Scripture, either implicitly or explicitly. It's easy to allege that something has been misleadingly taken out of context, and it is quite another thing to provide the context that clarifies the meaning of the quotation.
Athanasius's writings show no signs of sola Scriptura, but rather of his staunchly orthodox Catholicism. Athanasius, for example, wrote:These are his two go-to quotations from Athanasius, but neither of these statements involves any rejection of sola Scriptura. The first statement, for example, does not say that it is because of the authority of Nicaea that the confession is sufficient. Nor does the second statement refer to some extra-scriptural tradition. On the contrary, it refers explicitly to Matthew 28:19. Look at the complete statement in its context:The confession arrived at Nicaea was, we say more, sufficient and enough by itself for the subversion of all irreligious heresy and for the security and furtherance of the doctrine of the Church. [Ad Afros, 1.]And:[T]he very tradition, teaching, and faith of the Catholic Church from the beginning was preached by the Apostles and preserved by the Fathers. On this the Church was founded; and if anyone departs from this, he neither is nor any longer ought to be called a Christian. [Ad Serapion, 1:28]
28. But, beyond these sayings, let us look at the very tradition, teaching, and faith of the Catholic Church from the beginning, which the Lord gave, the Apostles preached, and the Fathers kept. Upon this the Church is founded, and he who should fall away from it would not be a Christian, and should no longer be so called. There is, then, a Triad, holy and complete, confessed to be God in Father, Son, and Holy Spirit, having nothing foreign or external mixed with it, not composed of one that creates and one that is originated, but all creative; and it is consistent and in nature indivisible, and its activity is one. The Father does all things through the Word in the Holy Spirit. Thus the unity of the holy Triad is preserved. Thus one God is preached in the Church, 'who is over all,and through all, and in all' — 'over all', as Father, as beginning, as fountain; 'through all', through the Word; 'in all', in the Holy Spirit. It is a Triad not only in name and form of speech, but in truth and actuality. For as the Father is he that is, so also his Word is one that is and God over all. And the Holy Spirit is not without actual existence, but exists and has true being. Less than these (Persons) the Catholic Church does not hold, lest she sink to the level of the modern Jews, imitators of Caiaphas, and to the level of Sabellius. Nor does she add to them by speculation, lest she be carried into the polytheism of the heathen. And that they may know this to be the faith of the Church, let them learn how the Lord, when sending forth the Apostles, ordered them to lay this foundation for the Church, saying: 'Go and make disciples of all nations, baptising them in the name of the Father and of the Son and of the Holy Spirit.' The Apostles went, and thus they taught; and this is the preaching that extends to the whole Church which is under heaven.The final line of the section clarifies and explains the first line of the section, quoted by Madrid. Thus, it turns out that Madrid has misled his readers by quoting Athanasius out of context, as though Athanasius were referring to something other than Scripture.
The letters of Athanasius to Serapion were translated a bit later than some of his more famous works. The editor of the translation, however, points out that there weren't any contemporary critics of authenticity of these letters, and that Erasmus is the most notable person to reject letter 1 (the one that Madrid directed us to). The editor provides this interesting observation (p. 14 - bold emphasis mine):
That the style of these letters is heavier and less attractive than that of Athanasius's best works will readily be admitted. But it must be remembered that it was written under very difficult circumstances, and that the writer himself regards it as needing correction and polish. Parts of it are little more than a series of Scriptural quotations. As Montfaucon says, to complain of a stiff and heavy style in the handling of such material, 'idipsum sit quod nodum in scirpo quaerere'. If further proof is needed, the reader is referred to the notes, which illustrate at many points the close connexion in thought and language between these letters and the other works of Athanasius.Notice that this is a comment from someone intimately familiar with the works, not someone considering an isolated quote own its own.
Apart from isolated references in later works, we cannot be certain that Athanasius ever wrote anything further on the doctrine of the Spirit. Few genuine works survive from the last decade of his ministry. Had we, for instance, his correspondence with Basil, the story might be different. As it is, two works which Montfaucon thinks genuine and dates after 362 fall to be considered. The de Incarnatione et contra Arianos deals with the Godhead of the Spirit, 9-10 and 13-19; and the de Trinitate et Spiritu Sancto, which survives only in Latin, is chiefly a series of proof texts in support of that doctrine. The two works are closely connected; without being a transcript, one of them is clearly dependent upon the other.
As to the letter Ad Afros, keep in mind that this was a group letter by ninety Egyptian and Liberian bishops (including Athanasius) to the other bishops of Africa. The quotation may sound strongly worded in favor of Nicaea, but consider the opening line of the letter:
The letters are sufficient which were written by our beloved fellow-minister Damasus, bishop of the Great Rome, and the large number of bishops who assembled along with him; and equally so are those of the other synods which were held, both in Gaul and in Italy, concerning the sound Faith which Christ gave us, the Apostles preached, and the Fathers, who met at Nicæa from all this world of ours, have handed down.Notice the parity with which the African bishops treat the various councils, including those presided over by Damasus. So, it is definitely true that we should be careful about jumping to conclusions just because the group of bishops uses the word "sufficient."
The group of bishops, in Ad Afros, advanced the argument of the council of Nicaea against the council of Ariminum. However, to prove that Nicaea is superior to Ariminum, the group of bishops argue that the Nicene foruma is in accordance with Scripture (section 4) of the letter. Moreover, the bishops defend the term "co-essential" as expressing the sense of Scripture, even though it is not the express term used in Scripture.
Although the letter does appeal to the allegedly ecumenical nature of the council as a persuasive reason for adopting its position, nowhere in the letter does the group of bishops say or suggest that the council's decision has equal authority in itself with Scripture, simply by virtue of being ecumenical. Furthermore, the letter expressly states, section 5, that the council fathers "wished to set down in writing the acknowledged language of Scripture" and that the only reason they used a word not from Scripture was that the Arian party kept twisting the meaning of those phrases. Thus, section 6 explains: "And lastly they wrote more plainly, and concisely, that the Son was coessential with the Father; for all the above passages signify this." In other words, the Nicene fathers weren't passing on unwritten tradition or defining dogma by their authority, but simply expressing the teachings of Scripture.
(Letter Ad Afros) (Letters to Serapion)