Inayat Khan's Character Building /The Art of Personality, lectures from 1923, published in 1931, contain a blueprint of the soul's journey on earth and a manual for cultivating one's character.
Of these lectures, Inayat Khan said that they - together with The Soul, Whence and Whither? (his teachings about the soul's arc of descent and ascent) - completed his Sufi teachings.
Honoring Inayat Khan's Indian training and background and his deep interest in Hindu spirituality, the book compares his teachings with the teachings of the great nineteenth century Indian saint Sri Ramakrishna, the teacher of Swami Vivekananda, and with the Upanishads, emphasizing on the Katha Upanishad, a dialogue with Yama, the King of Death.
With chapters on the awakening of the soul, attainment and the path of mastery (sadhana), one's personal goal in life, the alchemy of personality, letting go and the question what makes the personality and the feeling of ‘I', culminating in perfecting our humanity, this book is a practical manual for perfecting one's inner being and at the same time an introduction in both the Sufi path and the Hindu path of Advaita Vedanta and Bhakti according to Hazrat Inayat Khan, Ramakrishna & the Upanishads.