A Thousand Years of Yesterdays is a fictional story which introduces and explains Rosicrucian beliefs, reincarnation and spiritual philosophy to the curious reader. The narrative seeks to give the reader an example of reincarnation. The wisdom and thinking vested into the notion that human beings are reborn into a new life is succinctly explained in the story. Within the narrative are a number of meanings; the author, H. Spencer Lewis, created this tale as an introduction to the Rosicrucian outlook on life. Ideas upon human genetics, the transmigration of the soul, and what it is to be a human are touched upon. The narrative takes place inside the mind of William Rollins, which traverses memories spanning several lifetimes - the very essence of identity and meaning of the various lives already lived are told in a manner profound yet clear.