The speaker discusses his experience with DMT, noting that he was influenced by writers like Terrence McKenna and one other writer who captured the essence of the DMT experience. He recounts his decision to try DMT, which he did in 2014, leading to a belief in reincarnation. His DMT experience provided him with a 'user manual for the cosmos,' confirming the existence of reincarnation and aligning with Buddhist beliefs about the afterlife.