Holmes, D.L., A Brief History of the Episcopal Church, pp2-3, "Called 'justification by grace through faith,' this central teaching of Protestantism is articulated in such hymns as 'A Mighty Fortress is Our God,' 'Ah, Holy Jesus,' and 'Just as I Am.'"
WELS Topical Q&A: Sola Scriptura, "many passages...state sola scriptura, such as Revelation 22:18-19. If we cannot add anything to the words of Scripture and we cannot take anything away from them, that is Scripture alone."
Anckar, Carsten (2022), Religion and Democracy: A Worldwide Comparison, p103, "Wide definition of Protestantism...includes Protestants, Marginal Christians, Anglicans, Christian Independents, and unaffiliated Christians"
Christian Traditions. Pew Research Center. 2011 [2016-08-05]. （原始內容存檔於2017-07-20）. Independent Christians include denominations in sub-Saharan Africa that identify as independent from historically Protestant denominations, churches in China that are not affiliated with official religious associations and nondenominational churches in the United States.
Löffler, Klemens, Pope Leo X （頁面存檔備份，存於互聯網檔案館）, in The Catholic Encyclopedia (天主教百科全書), New York: Robert Appleton Company, 1910, "The immediate cause was bound up with the odious greed for money displayed by the Roman Curia, and shows how far short all efforts at reform had hitherto fallen...(The pope) gave himself up unrestrainedly to his pleasures and failed to grasp fully the duties of his high office."
Hillerbrand, Hans J., The Encyclopedia of Protestantism, p1002, "As early as 1515, while lecturing on Romans, Luther came to see that the individual, because of sinfulness, could not initiate this process of justification. Furthermore—again under the influence of Augustine—Luther concluded that the whole idea of facere quod in se est was in reality a Pelagian heresy. By rejecting the notion that the individual has the inherent ability to initiate the process of justification, Luther moved inexorably to challenge the soteriological framework of the via modema."
Indulgence sales in the Middle Ages. Wisconsin Evangelical Lutheran Synod. [3 May 2022]. （原始內容存檔於2018-10-19） （英語）. Roman Catholic sources...acknowledge Leo X’s involvement in the abuse of indulgence sales. One such source is The Catholic Encyclopedia. It has the designations of nihil obstat and imprimatur, indicating that the Roman Catholic Church has reviewed the contents and declared the work to be free from doctrinal or moral errors.
What About Jesus? Book by Book: Galatians. Wisconsin Evangelical Lutheran Synod. [3 May 2022]. （原始內容存檔於2022-06-10） （英語）. Galatians greatly affected Martin Luther 1,500 years later. Luther called Galatians 「my own little epistle」 and said that he was 「married」 to this epistle. Galatians gave Luther the strength to fight against the legalism of the Church of Rome and to hold high the Gospel of pure grace in Christ.
Lossky, Vladimir, Tradition and Traditions, in Eastern Orthodox Theology: A Contemporary Reader (Daniel B. Clendenin, ed.), Grand Rapids: Baker Book House, 1995, p128, "An advance is made toward a purer notion of tradition if this term is used to designate solely the oral transmission of faith. The separation between tradition and Scripture still subsists, but instead of isolating two sources of revelation, one opposes two modes of transmitting it: oral preaching and writing. It is then necessary to put in one category the preaching of the apostles and of the successors, as well as all preaching of faith performed by a living teaching authority, and in another category the Holy Scripture and all other written expressions of the revealed truth (these latter differing in the degree of authority recognized by the church). This approach affirms the primacy of tradition over Scripture, since the oral transmission of the apostles' preaching preceded its recording in written form in the canon of the New Testament. It might even be said that the church could dispense with the Scriptures, but she could not exist without tradition", quoted in WELS Topical Q&A: Russian Orthodox Church
Baptist Confession of Faith（1689）, Chapters 19-20, "The same law that was first written in the heart of man continued to be a perfect rule of righteousness after the fall, and was delivered by God upon Mount Sinai, in ten commandments, and written in two tables, the four first containing our duty towards God, and the other six, our duty to man....The covenant of works being broken by sin, and made unprofitable unto life, God was pleased to give forth the promise of Christ, the seed of the woman, as the means of calling the elect, and begetting in them faith and repentance; in this promise the gospel, as to the substance of it, was revealed...This promise of Christ, and salvation by him, is revealed only by the Word of God"
The Formula of Concord: Solid Declaration（1577）, V. Law and Gospel, par. 20 （頁面存檔備份，存於互聯網檔案館）,"[T]he Gospel is properly a doctrine which teaches what man should believe, that he may obtain forgiveness of sins with God, namely, that the Son of God, our Lord Christ, has taken upon Himself and borne the curse of the Law, has expiated and paid for all our sins, through whom alone we again enter into favor with God, obtain forgiveness of sins by faith, are delivered from death and all the punishments of sins, and eternally saved. For everything that comforts, that offers the favor and grace of God to transgressors of the Law, is, and is properly called, the Gospel, a good and joyful message that God will not punish sins, but forgive them for Christ's sake."
Keller, Brian. Believe it or not: You are forgiven through Christ!(PDF). 2013 [2022-05-06]. （原始內容(PDF)存檔於2022-05-16） （英語）. The Greek verb for 'justified' means that a judge declares people 'not guilty' of all charges. They are in a constant state of being declared not guilty，'freely by his grace.'
Keller, Brian. Believe it or not: You are forgiven through Christ!(PDF). 2013 [2023-08-30]. （原始內容存檔(PDF)於2022-05-16） （英語）. When the Holy Spirit works faith in an individual’s heart, that person is a believer who receives the forgiveness of sins and also receives the benefits and blessings Jesus won for all on the cross. Only believers receive eternal life.
Stavropoulos, Christophoros, Partakers of the Divine Nature, in Eastern Orthodox Theology: A Contemporary Reader, 頁188, "The work of our theosis, our union with God, is not transmitted to us in some mechanical fashion. Our weakened human nature will not be transformed magically. The change will happen in conjunction with our own efforts. It will be realized with the cooperation of man and God. This subjective aspect of our union provides the way of theosis which we must follow."
WELS Topical Q&A: The Greek Orthodox Church （頁面存檔備份，存於互聯網檔案館）, "Greek Orthodox Church teaching regarding salvation is a mixture of faith and morality."
《天主教教理》（1992） 第2068條：「眾人因信德、聖洗及遵守誡命而得救」（all men may attain salvation through faith, Baptism and the observance of the Commandments.）」； 第2010條：「在聖神和愛德的推動之下，我們才能為我們自己並為他人賺得為成聖、為增加恩寵和愛德，一如為得到永生有用的恩寵。」（Moved by the Holy Spirit and by charity, we can then merit for ourselves and for others the graces needed for our sanctification, for the increase of grace and charity, and for the attainment of eternal life.）」； 第2027條：「我們能為自己和為別人賺得一切有用的恩寵，為到達永生，和得到必須的世物。」（we can merit for ourselves and for others all the graces needed to attain eternal life, as well as necessary temporal goods.）」； 第2036條：「訓導的權威也伸展到自然律的特殊規範，因為造物主要求遵守的這些規範，為得救是必要的。」（The authority of the Magisterium extends also to the specific precepts of the natural law, because their observance, demanded by the Creator, is necessary for salvation.）
WELS Topical Q&A: Salvation By Works Questioned, "The Catechism of the Catholic Church is clear in stating that we merit salvation in part by our works. Read paragraphs 1987 through 2029, note especially 2001, 2002, 2009, 2010, 2019, 2027."
WELS Topical Q&A: Celebrating Lent （頁面存檔備份，存於互聯網檔案館）, "In Old Testament times God spelled out the weekly day of worship (Saturday, the Sabbath) and the three major annual festivals (Passover, Pentecost, Tabernacles). As New Testament Christians we are free from the ceremonial laws that commanded observance of those days and festivals (Galatians 4:9-11; Colossians 2:16-17)."
Winkler, Heinrich A. (2012), Geschichte des Westens. Von den Anfängen in der Antike bis zum 20. Jahrhundert, Third, Revised Edition, Munich (Germany), p. 233
Cook，Martin L. (1991). The Open Circle: Confessional Method in Theology. Minneapolis，Minn.: Fortress Press. xiv，130 p. N.B.: Discusses the place of Confessions of Faith in Protestant theology，especially in Lutheranism. ISBN 978-0-8006-2482-8
Dillenberger，John，and Claude Welch (1988). Protestant Christianity，Interpreted through Its Development. Second ed. New York: Macmillan Publishing Co. ISBN 978-0-02-329601-7
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