These are the circumstances which I had to communicate respecting the published formulary of the faith. To it we all agreed, not without investigation, but, after having subjected the views submitted to us to thorough examination in the presence of our most beloved emperor, for the above reasons we all acquiesced in it. We also allowed that the anathema appended by them to their formulary of faith should be accepted, because it prohibits the use of words which are not scriptural; through which almost all the disorder and troubles of the Church have arisen. And since no passage of the inspired Scripture uses the terms 'out of the non-existent,' or that 'there was a time when He was not,' nor indeed any of the other phrases of the same class, it did not appear reasonable to assert or to teach such things. In this opinion, therefore, we judged it right to agree; since, indeed, we had never, at any former period, been accustomed to use such terms. Moreover, the condemnation of the assertion that before He was begotten He was not, did not appear to involve any incongruity, because all assent to the fact that He was the Son of God before He was begotten according to the flesh. And here our emperor, most beloved by God, began to reason concerning His divine origin, and His existence before all ages. He was virtually in the Father without generation, even before He was actually begotten, the Father having always been the Father, just as He has always been a King and a Saviour, and, virtually, all things, and has never known any change of being or action.
“We have thought it requisite, beloved brethren, to transmit you an account of these circumstances, in order to show you what examination and investigation we bestowed on all the questions which we had to decide; and also to prove how at one time we resisted firmly, even to the last hour, when doctrines improperly expressed offended us, and, at another time, we, without contention, accepted the articles which contained nothing objectionable, when after a thorough and candid investigation of their signification, they appeared perfectly conformable with what had been confessed by us in the formulary of faith which we had published.”
Source: Ecclesiastical History (New Advent)