From Gnostic Cosmology:

Not all Gnostics considered themselves Christians and Gnosticism seems to have originated apart from Christianity, but those who did synthesize the two movements considered Jesus the divine being who delivered the gnosis that redeems humanity. As the messenger from the divine realm, though, Jesus had to be completely spirit; the divine could inhabit material flesh. So Gnostics had to explain why Jesus appeared human. One solution was to claim just that-he only appeared human. Referred to as docetism [5], this view held that Jesus put on act of seeming to hunger, to eat, to thirst, to bleed, to die, as he taught his disciples the saving gnosis. The insight was only for the elect who carried the divine spark and so Jesus feigned humanity-as Paul says, Christ came ?in the likeness of sinful flesh? (Romans 8:3)-to conceal the revelation from the non-Gnostics (Ehrman 167). For the same reason Jesus taught in parables, concluded them by saying ?Let he who has ears to hear, hear,? referring to the hidden truth that the elect could find in the parable; and later explained the meaning of the parables to his disciples in private. The parables themselves often depicted the ?kingdom of heaven? as something, such as yeast or a treasure, which one hides [6]. As the anti-Gnostic writings of ecclesiastics including Ireneaus and Tertullian reveal, proto-orthodox Christianity, which would eventually win-in terms of numbers of followers-the intense and polemical theological battles of the second and third centuries, defined much of its theology through conflict with other Christian groups (Filoramo 4). And it declared docetism a heresy at the Council of Chalcedon in 423, deciding that Christ was ?fully human, fully divine.?

From Fragment H found in Clement of Alexandria:

For the many spirits dwelling in the heart do not permit it to become pure: rather, each of them performs its own acts, violating it in various ways with improper desires. And in my opinion the heart experiences something like what happens in a caravansary. For the latter is full of holes and dug up and often filled with dung, because while they are there, people live in an utterly vulgar way and take no forethought for the property since it belongs to someone else. Just so, a heart too is impure by being the habitation of many demons, until it experiences forethought.

From Allogenes:

Since it is impossible for the individuals to comprehend the Universal One situated in the place that is higher than perfect, they apprehend by means of a First Thought – not as Being alone, but it is along with the latency of Existence that he confers Being. He provides everything for himself, since it is he who shall come to be when he recognizes himself. And he is One who subsists as a cause and source of Being, and an immaterial material and an innumerable number and a formless form and a shapeless shape and a powerlessness and a power and an insubstantial substance and a motionless motion and an inactive activity. Yet he is a provider of provisions and a divinity of divinity…
But concerning the invisible, spiritual Triple-Powered-One, hear! He exists as an Invisible One who is incomprehensible to them all. He contains them all within himself, for they all exist because of him. He is perfect, and he is greater than perfect, and he is blessed. He is always One and he exists in them all, being ineffable, unnameable, being One who exists through them all – he whom, should one discern him, one would not desire anything that exists before him among those that possess existence, for he is the source from which they were all emitted. He is prior to perfection. He was prior to every divinity, and he is prior to every blessedness, since he provides for every power. And he a nonsubstantial substance, since he is a God over whom there is no divinity, the transcending of whose greatness and beauty …

From Zostrianos:

[…] enter […] the abundance […] those who […] I will speak my mystery to those who are mine and to those who will be mine. Moreover it is these who have known him who is, the Father, that is, the Root of the All, the Ineffable One who dwells in the Monad. He dwells alone in silence, and silence is tranquility since, after all, he was a Monad and no one was before him. He dwells in the Dyad and in the Pair, and his Pair is Silence. And he possessed the All dwelling within him. And as for Intention and Persistence, Love and Permanence, they are indeed unbegotten.

The Gnostics saw the universe as a duality between spirit and matter. They conceived of a supreme divine being who was immaterial, eternal, unreachable, and unknowable. In the Gnostic view, the spirit is a fragment of this universal being which has split off and become imprisoned in matter.

Bernard, Christian. Gnosticism: Digest (Rosicrucian Order AMORC Kindle Editions) (Kindle Locations 144-146). Rosicrucian Order AMORC. Kindle Edition.

From Allogenes:

He exists as an Invisible One who is incomprehensible to them all. He contains them all within himself, for they all exist because of him. He is perfect, and he is greater than perfect, and he is blessed. He is always One and he exists in them all, being ineffable, unnameable, being One who exists through them all – he whom, should one discern him, one would not desire anything that exists before him among those that possess existence, for he is the source from which they were all emitted. He is prior to perfection. He was prior to every divinity, and he is prior to every blessedness, since he provides for every power. And he a nonsubstantial substance, since he is a God over whom there is no divinity, the transcending of whose greatness and beauty …

The Teachings of Silvanus, a gnostic document, dated around 150AD:

For God does not need to put any man to the test. He knows all things before they happen, and he knows the hidden things of the heart. They are all revealed and found wanting in his presence. Let no one ever say that God is ignorant. For it is not right to place the Creator of every creature in ignorance. For even things which are in darkness are before him like (things in) the light.