I believe it was a thought that did not come from my mind but entered into it.
What do you mean? Something talked to you like an outside voice reflected as thoughts?
For example, I'm sitting next to my window looking out at a beautiful day. I have my aunts ashes around my neck (urn jewelry) and an small urn in the other room. As I think about her, I hear this voice not coming from me saying something she'd normally say but I wouldnt. She has a sense of humor. I keep her updated (she isnt omnipresent) on things. Regular convo. Real life rather than analogy.
The "voice" came from outside my head and reflected itself as thoughts with her tone. Psychologically, its a part of the grieving process that, depending on how close one is, depends on the "realness" of the voices. The close relationship heightens it.
Same as god. The closer you get to god, the more you can "hear his voice" inside you coming as your thoughts.
Unless you can describe the nature of the voice coming outside of you, the brain does a lot of things for mental survival. Can you explain the nature of this voice apart from your thoughts and connection with how you personally see god?
Does the outside voice tell you that its/hes a creator?
Is the nature of god only a reflection of outside thoughts, what you internalize from the bible, an person talking to you?
If all three, can you explain it individually?