Theosophy by Rudolf Steiner
A foundational text introducing esoteric wisdom and spiritual science. Steiner explores the nature of the soul, spiritual evolution, and humanity's connection to higher realms. The book emphasizes self-discovery, the spiritual world's realities, and the path to enlightenment.

Rudolf Steiner (1861–1925) was an Austrian philosopher, architect, and founder of Anthroposophy, a spiritual movement combining mysticism and science. His works include The Philosophy of Freedom and extensive writings on education, biodynamic agriculture, and holistic medicine, emphasizing spiritual science and human development.