Peter Deunov /ˈdənɒv/ (Bulgarian: Петър Дънов; July 11, 1864 - December 27, 1944), also known by his spiritual name Beinsa Douno (Bulgarian: Беинса Дуно), and often called the Master by his followers, was a Bulgarian philosopher and spiritual teacher who developed a form of Esoteric Christianity. He is widely known in Bulgaria, where he was voted second by the public in the Great Bulgarians TV show on Bulgarian National Television (2006-2007) after the BBC format.
Peter Deunov’s philosophy wouldn’t appear to be anything revolutionary at first. He based his beliefs on those of Christ and preached universal love and religious tolerance—only with a more mystical, cosmic slant. Known as Master Beinsa Douno, he garnered a following in Bulgaria in the early 20th century for his teachings, now known as Esoteric Christianity. In fact, during Deunov’s time serving as the Vatican’s ambassador to Bulgaria, the future Pope John XXIII called him “the greatest philosopher living on the Earth.”

According to the Master Petar Deunov man is the manifestation of the integrated existence. In its person the latter reveals its essence. The sense of human life on earth is to realize, throughout multiple reincarnations, a higher reason, to acquire liberation from the limitations of the lower forms of existence. Man has to liberate himself gradually from his animal instincts and this must be done not by destroying them but by submitting them to the higher life. He has to create his higher bodies, to reveal himself for the supreme Divine conscience and for the supreme love and to become a more perfect organ in the Divine system.
Everyone has to liberate himself from his low egoism and limited conscience and has to begin living in a greater harmony with the Divine entity. The more completely he reveals himself throughout this entity, the greater is his harmony with the reasonable nature, with God. In his spiritual doctrine the Master Petar Deunov relies on spirit and on the major origins of the true Christianity. He wants to get people acquainted with it in its pure form. In his lectures the Master explains that new and great force which comes in the world with the help of the living and always creating in our souls Christ, manifesting himself in all great and wonderful things that happen in our lives.

If God had spoken to people in the past – says Petar Deunov – he keeps on talking to them nowadays too; if he doesn't speak to them today – it means that he has never spoken at all. The most important thing is: what does God want to say us and what does he say to people now. The most important are the “last letters” of your heavenly father!
For the Master Petar Deunov the feelings and the thoughts in the higher worlds are as real as the objects in the material world. They are living powers, which destroy and create. The supreme creative powers are the supreme cosmic or Divine conscience, the Divine thought and the Divine Love. The further in his evolution a spiritual being is, the greater these powers' presence is in him.
In the doctrine of the Master Petar Deunov nature is a supreme reality manifested externally, a supreme reason and love. It has concealed its spiritual and Divine face for the lower conscience. The latter sees only the shadow of things, their changeable visibility, and not their real content, the real life, nor those spiritual and reasonable creative powers, which manifest themselves and act behind that visibility. Science has so far studied only the external form and it's just now that it becomes interested in these real creative powers. All things in nature, being a manifestation of a supreme reason, have a profound internal meaning. The true science has to go further from studying just content. It has to discover the profound meaning of things.

In 1932, he developed Paneurhythmy exercises: a sequence of exercises performed to music, to achieve inner balance and harmonization. And if nowadays, we who read the words of the Master do try to discover the spiritual grounds of his doctrine, it would be probably the following: