Open Genesis 1 and look at the commentary attached to it. You will find St. Basil the Great, St. Gregory of Nyssa, St. Methodius of Olympus and Julius Africanus, among dozens of separate passages.
Read them and you will notice something that makes some converts nervous. They do not all handle the six days the same way.
I want to talk about that, because how you react to it will shape your whole relationship with the Fathers.
The range
St. Basil's Hexaemeron is nine sermons on the six days, preached to a working congregation, and it is in the Fathers Library in full. Basil is famously restrained. He is impatient with the philosophers who measure the distances of the stars while shutting their eyes to the knowledge of the truth, and he is generally content to take the text as it stands rather than dissolve it into allegory.
His brother St. Gregory of Nyssa wrote On the Making of Man as a continuation of that very work. Read his opening letter to their brother Peter and you will see him say plainly that he is picking up where Basil left off. Gregory is a far more speculative mind, and he reaches for philosophical categories where Basil stays close to the ground.
Two brothers. Same family, same tradition, same generation, different instincts. And the Church canonised both.
Origen sits further out again, allegorising heavily, and the Church received a great deal from him while also rejecting things he taught. That combination confuses people, and it should not.
What they do not disagree about
Here is the part that matters, and if you take one thing from this article take this.
Every one of them holds that God created all things out of nothing, freely, by His word. That creation is good because He made it. That man is made in the image of God and is the crown of the visible creation. That there is no second god, no eternal matter, no evil creator.
That is the dogma. That is not up for grabs and never was.
The disagreement is about how to read the six days. Literal solar days, or a framework, or a sequence with a meaning beyond duration. That is not the same kind of question, and the Church has never made it a test of faith.
Dogma and theologoumenon
The Church has a category for this and it is worth learning the word. A theologoumenon is a theological opinion held by Fathers, sometimes by many of them, which the Church has not defined as dogma.
Dogma is settled. You do not get to have a personal opinion against it. As I have said before, the Bible is not a puzzle to be solved, because the dogma has already been established, and if you go rewriting it for your own satisfaction, you are not doing what a Christian does.
But a theologoumenon is genuinely open. And confusing the two goes wrong in both directions. Treat an opinion as dogma and you start excommunicating people over things the Church never defined. Treat dogma as an opinion and you are inventing your own religion.
The six days are the first kind. The Trinity is the second kind. Learn to tell them apart and half of the arguments you see online will resolve themselves.
Why the Church allows the range
Because Genesis 1 is not primarily answering the question modern people bring to it.
We come at it out of a two hundred year old fight with modern science and we want it to settle a chronology. The Fathers came at it wanting to know who God is, what the world is, and what man is for. They were reading it against Greek philosophers who thought matter was eternal and against Gnostics who thought the creator was evil. Those were the live questions, and on those questions the Fathers are united and ferocious.
So when you read Basil and find him not answering your question, it is worth considering that your question may not be the most important one in the chapter.
What this does to your reading
It should relax you and make you more careful at the same time.
Relax, because you will meet Orthodox Christians who read the days differently than you do and you do not have to fight them. Both of you can be inside the Church's mind.
Be careful, because the freedom is bounded. It is freedom about the manner of the days, not freedom to say that God did not create, or that matter is evil, or that Adam is only a symbol with nothing underneath. The fence is real even though there is room to move inside it.
And never suspend your critical thinking. If you suspend it you are in a cult. Follow the reason all the way and you will find God at the end of it. That is how many of us got here.
Read it for yourself
- Read Genesis 1 in full, then read every Father attached to it in the Church Fathers section.
- Use the saint filter to read one author at a time so you can hear each voice on its own.
- Then read Basil's Hexaemeron straight through in the Fathers Library, and Gregory's On the Making of Man after it, in that order. They were written to be read that way.
You will come out of it with a bigger God and a smaller argument. That is usually the sign you have read something properly.