Well first off, determine what makes you think this is gnosis? Was it a revelation that of some importance to you? Did it help you understand mysteries of life love and or death? Once you have characterized the value of this spiritual/sacred knowledge you have attained, then determine whether it will be helpful to others. Can you communicate the epiphany you had and how should you communicate it? For example, I often choose to paint my personal gnosis—it allows people the chance to experience it in some small way themselves directly. Historically others have told them as stories around the fireplace. They told these stories vividly and people could imagine themselves in the experience and for those who it was the time for, they could have that aha moment too. Poetry works in between these two, like a painting it really allows for the reader’s interpretation and interaction with the work, divine inspiration travels especially well via poetry.
After you have determined the power of the gnosis, your reason for sharing and your medium for sharing—then you should figure out how you would frame your information. If you are going to just tell people about it without using an artistic medium, but instead just want to say I experienced xy and z in the astral—then be sure to also share in what way you got to the astral. What it felt like, how you knew it was gnosis and so on. If you are going to use it instruction-ally instead of as a work of art or literature, then you should explain your reasons for sharing and how it might be of value to them. If any parts of your experience do line up with lore, then perhaps point that out. Having some source material as a basis for why your gnosis could potentially add to the body of spiritual realizations we already have helps people decide if they want to include it in their own practices or not. And with a little research you might find confirmation of your experienced knowledge and you can share them side by side.
I had a vision of the Morrigan cuddling a baby with worms or snakes imbedded in its head. I had this as a dream. I drew it. And for some reason it stuck with me. Eventually I read about one of the figures of the Morrigan having a son with three snakes in his heart. When he was slain it saved Ireland. I realized my vision was an earlier part of that story, and while I still don’t know its meaning for sure, I sit on it because I think it has to do with the Morrigan’s son protecting the land by taking on this danger himself, and when he died he took that danger with him away. It tells me about personal sacrifice for others and war. Anyways—its too hard to really explain and that is why I draw and paint about it instead, so others can think about it as an image and symbol up for their interpretation and understanding.
If you share it as a poem, painting or tell it orally as a story, then a lot of that is communicated by the style and delivery and people who it is right for will absorb it rather than needing source material (sources being your method, what lore it relates to and your thoughts and interpretation) with art and literature the viewer often figures out the sources themselves (“oh that relates to another old story I know of, and I am feeling an epiphany myself from this work, this is connected to this and it makes sense to me!”)
These are all considerations to make when sharing personal gnosis. In witchcraft we realize you can scream the mysteries off the mountain tops but only those prepared to understand them will. In witchcraft we really don’t have upg so much as a thing, we just have the mysteries. And when you meet someone else who gets them you realize you both have been initiated into them by the spirits or a teacher or coven or whatever because it all registers for you both.