"He gave aeons for the father of all aeons, I the thought of the father, first thought, Barbelo, the perfect glory and the immeasurable invisible hidden one. I am the image of the invisible spirit. "
http://www.gnosis.org/naghamm/trimorph-barnstone.html
"And his thought performed a deed and she came forth, namely she who had appeared before him in the shine of his light. This is the first power which was before all of them (and) which came forth from his mind, She is the forethought of the All - her light shines like his light - the perfect power which is the image of the invisible, virginal Spirit who is perfect."
http://www.gnosis.org/naghamm/apocjn.html