(Start of the text)
The gospel of truth is joy to those who have received from the Father of truth the gift of knowing him by the power of the Logos, who has come from the Pleroma and who is in the thought and the mind of the Father; he it is who is called “the Savior,” since that is the name of the work which he must do for the redemption of those who have not known the Father.
Thought and mind belong to the demiurge however tbe substance is tbe one formless nature.
Logos i translate as reason. Pleroma i translate as formless unity (oneness).
The father is the oneness which requires reason (logos). It is the role of the savior to reveal the oneness (pleroma) which is tbe father. The thought and mind of the father i translate as tbe means to reason (logos) with to discern the oneness.
The tbought and mind are needed to realise the constant unchanging nature.