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I've found that the more my eyes want to grasp something the quicker that energy signature or pattern fades from sight
This is what i had trouble with whenever i actually realized that i was seeing sylphs. I would try to focus on them and my vision would go back to normal. But once i would just breathe and just unfocus i would be able to see them a lot more clearly. I will have to check out the book always nice to read some different techniques.