You are presenting me with a document that is supposed to support your own non-trinitarian and subordinate view of early Christians, where in fact the passages above show exactly the opposite.
I think
@muhammad_isa has confused himself here, in assuming a Gnostic text he assumes it must be anti-Trinitarian.
He's wrong, but he'll never admit it. The text is fundamentally Christological, but quite Trinitarian as well speaks for itself:
"The Father opens his bosom, but his bosom is the Holy Spirit.
He (the Holy Spirit) reveals his (the Father's) hidden self which is his Son (Christ Jesus)... "
The Son is the Name by which the Father knows Himself ... the Name the Father nurtured in his bosom before the creation of the Aeons ...
It gets all a bit Gnostic with its 'Error' and its emanationism, but otherwise it's surprisingly orthodox. The author of the homily (it's not itself a gospel), either Valentinus or a disciple, follows closely the Gospel of John, and references the other Gospels, and St Paul.
A note: The title "The Gospel of Truth' is taken from the opening words, the beginning of a long sentence, a common practice is the Hebrew Scriptures, and presumably followed here because there was no other attribution of the text, but there is no evidence that this was Gnostic practice, so 'Gospel of Truth' is a given title, for the want of anything definite.