C. W. Leadbeater 
Textbook of Theosophy [PDF ebook] 

Theosophy is an ecumenical faith tradition that regards all religions as striving toward the same shared purpose of engendering love, cooperation, unity, and fellow-feeling among all of the world’s cultures. A Textbook of Theosophy offers a comprehensive introduction to theosophical thought and practice; it’s perfect for beginners just getting acquainted with this school of thought or long-time adherents seeking new insights.