The Key of the Ocean.
This is an adaptation for the 21st century aplicable to many cultures, didactic, effective, memorable and concrete, so that you can perfectly understand and start as soon as possible. It unifies historical lines along with science explanations, built for the benefit of every human being, and therefore, of the world. If you ever had a moment that is commonly known as "My mind went blank", you experienced, at least for a few seconds, what all branches of Buddhism and Hinduism aim to develop, that empty space that exists between one thought and another seeks to expand, and you will come to a point where you can stay there indefinitely without being interrupted by any thoughts. Therefore I create exercises in a simple format, without much text or loaded with the cultural perspective (I recommend you to read "The Tibetan Book of Living and Dying", "The Yoga of Sleep", among other books; feel free to ask me for the PDF files if you are interested). These are a...