The great lie about the Council of Nicea:
The men gathered at Nicea for two main reasons. To refute the Arian heresy, and to reject false writings as Scripture.
1. They did refute Aarian by Scripture: they relied on John 1:1 & 17:22, while Aarian distorted John 14:28.
They did not use 'outside sources of traditions', as though they did not believe the Bible was sufficient to stand alone for itself to refute any and all heresies.
That 'tradition' of Scriptural insufficiency is a lie. It was later made up by the future fathers and leaders of the Catholic Religion, which they then used to legitimize the use of outside source of traditions, as equal to Scripture and Scriptural doctrine.
The fathers and leaders of the Catholic religion were not the Sola Scriptura leaders at the council of Nicea.
2. The leaders at Nicea did not determine that the writings of the prophets and apostles were indeed Scripture. The 'Bible' or totality of Scripture was already well known by the end of the 1st century, and was first listed at the end of the 3rd century.
All the leaders did was weed out any other writings, that had purported to be also Scripture, as by a prophet or apostle of Christ.
They rejected all such outside writings by comparing them to the known Scriptures they had from the prophets and apostles: Sola Scriptura.
Paul spoke of such men that would try to transform themselves into apostles, and the leaders at Nicea rejected them as such, being faithful to what they already knew to be Scripture: Genesis to Revelation, which was written by John as the last book of prophecy of God toward the end of the 1st Century.
The leaders of Nicea were all Sola Scriptura: they rejected heresy by Scripture, and they rejected false writings by Scripture.
They did not use outside sources to defend Scripture, and they did not determine that the writings they had from the prophets and apostles were to be, for the first time, declared Scripture.
It's all a lie by them that tried to take over the church and body of Christ to form their own religion, while using His name for effect, and continuing to give lip service to the Scripture of the Bible.