PLUS FOUR, n. (++++) A rare and precious transcendental state, which has been called a "peak experience," a "religious experience," "divine transformation," a "state of Samadhi" and many other names in other cultures. It is a state of bliss, a participation mystique, a connectedness with both the interior and exterior universes, which has come about after the ingestion of a psychedelic drug, but which is not necessarily repeatable with a subsequent ingestion of that same drug.  
[Shulgin Scale]

"The experience that engulfs one's entire being as one slips beneath the surface of the DMT ecstasy feels like the penetration of a membrane. The mind and the self literally unfold before one's eyes. There is a sense that one is made new, yet unchanged, as if one were made of gold and had just been recast in the furnace of one's birth. Breathing is normal, heartbeat steady, the mind clear and observing." 
-- Terence McKenna 

"Under the influence of DMT, the world becomes an Arabian labyrinth, a palace, a more than possible Martian jewel, vast with motifs that flood the gaping mind with complex and wordless awe. Color and the sense of a reality-unlocking secret nearby pervade the experience. There is a sense of other times, and of one's own infancy, and of wonder." 
-- Terence McKenna

(with 100 mg, smoked) "As I exhaled I became terribly afraid, my heart very rapid and strong, palms sweating. A terrible sense of dread and doom filled me -- I knew what was happening, I knew I couldn't stop it, but it was so devastating; I was being destroyed -- all that was familiar, all reference points, all identity -- all viciously shattered in a few seconds. I couldn't even mourn the loss -- there was no one left to do the mourning. Up, up, out, out, eyes closed, I am at the speed of light, expanding, expanding, expanding, faster and faster until I have become so large that I no longer exist -- my speed is so great that everything has come to a stop -- here I gaze upon the entire universe." 
-- TiHKAL, DMT

N,N-DMT