Summary: The series of letters of Sri Aurobindo were reissued in 1950 and 1954, with additional material published in Volumes VI and VII in 1958. The present volumes, 22, 23, and 24 of the Sri Aurobindo Birth Centenary Library, include a large number of additional letters in addition to those in Tomes One and Two. These letters focus on the psychic and spiritual transformation of the being, drawing a distinction between psychicization and spiritualization. The text delves into the challenges and difficulties faced on the path of yoga, emphasizing the importance of perseverance, faith, and surrender to the Divine. Issues such as the vital transformation, resistance from the physical mind, and the inner growth of bhakti are explored, highlighting the need to overcome fixed ideas and habitual reactions that hinder progress in the yoga journey. The narrative emphasizes the power of Grace, the awakening of the psychic being, and the eventual conquest of obstacles through steadfast determination and openness to the higher forces at play within the individual.