A description by Jesus to the disciple John after the crucifixion:
And I asked to know it, and he said to me, "The Monad is a monarchy with nothing above it. It is he who exists as God and Father of everything, the invisible One who is above everything, who exists as incorruption, which is in the pure light into which no eye can look.
"He is the invisible Spirit, of whom it is not right to think of him as a god, or something similar. For he is more than a god, since there is nothing above him, for no one lords it over him. For he does not exist in something inferior to him, since everything exists in him. For it is he who establishes himself. He is eternal, since he does not need anything. For he is total perfection. He did not lack anything, that he might be completed by it; rather he is always completely perfect in light. He is illimitable, since there is no one prior to him to set limits to him. He is unsearchable, since there exists no one prior to him to examine him. He is immeasurable, since there was no one prior to him to measure him. He is invisible, since no one saw him. He is eternal, since he exists eternally. He is ineffable, since no one was able to comprehend him to speak about him. He is unnameable, since there is no one prior to him to give him a name.
"He is immeasurable light, which is pure, holy (and) immaculate. He is ineffable, being perfect in incorruptibility. (He is) not in perfection, nor in blessedness, nor in divinity, but he is far superior. He is not corporeal nor is he incorporeal. He is neither large nor is he small. There is no way to say, 'What is his quantity?' or, 'What is his quality?', for no one can know him. He is not someone among (other) beings, rather he is far superior. Not that he is (simply) superior, but his essence does not partake in the aeons nor in time. For he who partakes in an aeon was prepared beforehand. Time was not apportioned to him, since he does not receive anything from another, for it would be received on loan. For he who precedes someone does not lack, that he may receive from him. For rather, it is the latter that looks expectantly at him in his light.
"For the perfection is majestic. He is pure, immeasurable mind. He is an aeon-giving aeon. He is life-giving life. He is a blessedness-giving blessed one. He is knowledge-giving knowledge. He is goodness-giving goodness. He is mercy and redemption-giving mercy. He is grace-giving grace, not because he possesses it, but because he gives the immeasurable, incomprehensible light.
"How am I to speak with you about him? His aeon is indestructible, at rest and existing in silence, reposing (and) being prior to everything. For he is the head of all the aeons, and it is he who gives them strength in his goodness. For we know not the ineffable things, and we do not understand what is immeasurable, except for him who came forth from him, namely (from) the Father. _Apocryphon of John