Secrecy was necessary in the previous era (Pisces). That era began to end in 1950, and the doors to the knowledge were fully opened by the 1960s when the Aquarian era began. What was esoteric in Pisces was revealed in Aquarius.
Unfortunately, religions and groups proudly retain their Piscean mentality, which demonstrates that they are totally asleep and crystallized in the forms of the past: ie. tombs full of bones.
It is also abundantly evident that practically none of the Piscean groups retained the most important Piscean esotericism: sexual transmutation. Piscean groups are filled with people who are very proud of their pseudo-esotericism and precious fornication.
All of this is explained throughout the books.
Let me also clarify that "secrecy" is perhaps not the correct word to use in relation with esotericism, particularly in the Aquarian era.
There are no authentic "esoteric" groups in the physical world. If something is taught in the physical world, it is not esoteric, but exoteric. As you see on this website and in the books. what was formerly esoteric is no longer.
Actual esotericism is not available in the physical world. It can only be learned in the astral world. This is not due to "secrecy" but the maturity required of the student, similar to how university classes are not taught to five year olds. To receive knowledge, one has to be capable of understanding and using it.
The authentic schools of mystery are found in the astral plane. This is why it is necessary for the disciple to learn how to “separate” the astral body from the physical body. It is necessary for the student to learn how to enter into those sanctuaries of inner instruction in order to receive direct instruction from the masters...
Whosoever wants to learn esoteric science has to travel in the astral body, because esoteric science is studied in the internal worlds, and esoteric science is learned only by personally conversing with the masters.
You may also want to consider this: