The feeling that we call “I” is an illusion. There is no discrete self or ego living like a Minotaur in the labyrinth of the brain.
The feeling that there is—the sense of being perched somewhere behind your eyes, looking out at a world that is separate from yourself—can be altered or entirely extinguished.
Although such experiences of “self-transcendence” are generally thought about in religious terms, there is nothing, in principle, irrational about them. From both a scientific and a philosophical point of view, they represent a clearer understanding of the way things are.