Easy to read and understanding as well explained, the texts of the liberation by listening nonetheless take on their full meaning when one is oneself familiar with the Vajrahyana. Read and re-read to fully absorb it. But I would have liked to find a more detailed table of contents for allowing me to regain some passages more quickly without having to re-leafing through a chapter and small "memory aid" spot synthetic photocopiables or detachable / nomads, to accompany the practice. This book however, is THE big reference in the field and an exceptional work.