Peter Deunov, who had the spiritual name Beinsa Douno, said that a new, spiritual epoch has begun in which human beings will come to live in love and freedom. His mission was to prepare us for this new life. He taught profound and practical Christianity, guiding his disciples to establish direct contact with the Spirit, and holding that true knowledge is only that which is personally tested and verified.

According to Peter Deunov, the inner side of all religions is the same, there being one great truth, that of the relationship between the human soul and God. This edition presents the lectures of the Teacher along with relevant passages from the Bible, in a suitable form for readers of the English language.