Originally Posted by Jonny T
I've seen the following quote here and there, attributed to Valentinus (the Gnostic), but have thus far been unable to find a specific cite.
If anyone's got an idea on the source help would be much appreciated.
This isn't my area of expertise, but I think the only extant work of Valentinus is the "Gospel of Truth" (it may have actually been written by a disciple.) It can be found online here.
For other Valentinian nuggets, you might want to check Irenaeus's Adversus Haereses
, Marcellus of Ancyra's On the Holy Church
, Tertullian's Adversus Valentinianos
, and possibly Clement of Alexandria's Stromateis
. All of these exist in English translation, and may even be online.