"By the time the rite was over Carter knew that he was in no region whose place could be told by earth's geographers, and in no age whose date history could fix. For the nature of what was happening was not wholly unfamiliar to him. There were hints of it in the cryptical Pnakotic fragments, and a whole chapter in the forbidden Necronomicon of the mad Arab Abdul Alhazred had taken on significance when he had deciphered the designs graven on the Silver Key. A gate had been unlocked—not indeed the Ultimate Gate, but one leading from earth and time to that extension of earth which is outside time, and from which in turn the Ultimate Gate leads fearsomely and perilously to the Last Void which is outside all earths, all universes, and all matter."
"Memory and imagination shaped dim half-pictures with uncertain outlines amidst the seething chaos, but Carter knew that they were of memory and imagination only. Yet he felt that it was not chance which built these things in his consciousness, but rather some vast reality, ineffable and undimensioned, which surrounded him and strove to translate itself into the only symbols he was capable of grasping. For no mind of earth may grasp the extensions of shape which interweave in the oblique gulfs outside time and the dimensions we know."
Likewise, upon traversing the First Gate, Randolph Carter finds himself completely detached from the limitations of space and time, and loses his physical form entirely in the process, becoming identifiable neither as a child nor as an adult, but only as a vague, abstract impression of an entity named "Randolph Carter.
"For the rite of the Silver Key, as practiced by Randolph Carter in that black, haunted cave within a cave, did not prove unavailing. From the first gesture and syllable an aura of strange, awesome mutation was apparent—a sense of incalculable disturbance and confusion in time and space, yet one which held no hint of what we recognise as motion and duration. Imperceptibly, such things as age and location ceased to have any significance whatever. The day before, Randolph Carter had miraculously leaped a gulf of years. Now there was no distinction between boy and man. There was only the entity Randolph Carter, with a certain store of images which had lost all connexion with terrestrial scenes and circumstances of acquisition. A moment before, there had been an inner cave with vague suggestions of a monstrous arch and gigantic sculptured hand on the farther wall. Now there was neither cave nor absence of cave; neither wall nor absence of wall. There was only a flux of impressions not so much visual as cerebral, amidst which the entity that was Randolph Carter experienced perceptions or registrations of all that his mind revolved on, yet without any clear consciousness of the way in which he received them."
"Almost stunned with awe, and with a kind of terrifying delight, Randolph Carter's consciousness did homage to that transcendent ENTITY from which it was derived. As the waves paused again he pondered in the mighty silence, thinking of strange tributes, stranger questions, and still stranger requests. Curious concepts flowed conflictingly through a brain dazed with unaccustomed vistas and unforeseen disclosures. It occurred to him that, if those disclosures were literally true, he might bodily visit all those infinitely distant ages and parts of the universe which he had hitherto known only in dreams, could he but command the magic to change the angle of his consciousness-plane. And did not the Silver Key supply that magic? Had it not first changed him from a man in 1928 to a boy in 1883, and then to something quite outside time? Oddly, despite his present apparent absence of body, he knew that the Key was still with him."
And as mentioned before: This is only the First Gate, and after passing through the Ultimate Gate leading directly to the outer void outside of existence, Carter perceives a multiplicity of them.
"Randolph Carter's advance through that Cyclopean bulk of abnormal masonry was like a dizzy precipitation through the measureless gulfs between the stars. From a great distance he felt triumphant, godlike surges of deadly sweetness, and after that the rustling of great wings, and impressions of sound like the chirpings and murmurings of objects unknown on earth or in the solar system. Glancing backward, he saw not one gate alone, but a multiplicity of gates, at some of which clamoured Forms he strove not to remember."