Four lectures introduce yoga as both a metaphysical framework and a practical discipline, arguing that the cosmos and evolution serve the unfolding of the Self and consciousness. The text surveys stages and states of mind, the mental and subtle bodies, samadhi, and connections with Indian philosophical schools, while defining key terms and literature. It classifies methods for approaching the Self, discusses ethical requirements, and treats meditation techniques including seed and non-seed practices, mantras, and attention training. Practical instruction addresses inhibition of mental states, common obstacles and capacities, purification of the bodies, preparatory measures, and the aim of self-realization.