In these four lectures Annie Besant traces the path of discipleship through perceptible and subtle milestones. The experience that is gained by action done for self-gratification could be elevated to a dutiful performance of rites and ceremonies for the settlement of karmic debts, which in turn could ascend into a joyful sacrifice that accomplishes union with the Divine. Control of mind, meditation, and building of character, qualifies the aspirant to receive the revelation of the Teacher. The life of the disciple that was preparatory in a general sense assumes more definite shape on the probationary path. A bird's eye view of the evolution of humanity as a whole, from the past to the future, is also laid before the seeker.