The Father reveals his bosom. His bosom is the Holy Spirit. He reveals through it what is hidden. What is hidden through it is his Son. So through the mercies of the Father, the aeons may know him and cease laboring in search of the Father, resting there in him, knowing that this is rest.
Gospel of Truth 24.10-20 (early Valentinian sermon)
Commentary: This passage is commenting on John 1:18 : "No one has ever seen God. The only-begotten God who is in the bosom of the Father has brought forth that one." Irenaeus says in Adv. Haer. 3.11.9 that the Gospel of Truth was written by the Valentinians who had more gospels than Irenaeus' church did, and at his time was a "comparatively recent" composition. Since he is writing between 180 and 190 CE, this would place the text's composition early to mid-second century at a time when Valentinus was still alive and teaching and writing. Pseudo-Tertullian reports that Valentinus had "a gospel of his own" (Adv. Haer. 4). Since the style of the Gospel of Truth reflects the style of the fragments of writing attributed to Valentinus, I am of the opinion that this Gospel was likely written by him as well and used as part of their catechism.
In the case of exegesis, note how the Prologue of John is understood to refer to the creation of the Godhead itself - the Pleroma - that the Son is hidden in God's bosom, the Holy Spirit, and is revealed to the aeons by the Holy Spirit. The revelation of the Son is the revelation of the Father, so the aeons can rest peacefully rather than continuing to be disturbed by Sophia's aborted attempt to know the unknown God.
And so our thinking about the Gospel of John continues.