The Great Book of the Holy Invisible Spirit, often referred to as The Gospel of the Egyptians (GosEgypt) is written in a good vein, supposedly according to the text itself by (Sethite) Seth himself. However, the TriProt better suits me as the former is a bit too esoteric for my tastes. Furthermore, as Alastair Logan referenced, it is a storehouse of contextual information. It doesn’t, however, make the Core of My Personal Canon.
As GosTruth 23 says, “This is a knowledge of the living book which he revealed to the Aeons, at the end, as his letters revealing how they are not vowels nor are they consonants, so that one might read them and think of something foolish, but they are letters of the Truth which they alone speak who know them. Each letter is a complete thought like a complete book, since they are letters written by the Unity, the Father having written them for the Aeons in order that by means of his letters they should know the Father.”
As a point of reference, GosEgypt contains incantations such as “iiiiiiiiiiiiii eeeeeeeeeeeee oooooooo uuuuuuuuu.” Accordingly, the book was written to entice some sort of ecstatic trance.