We can find the principle of the Song of the Vajra in the Upadesha tantra called Nyida Khajor, meaning Union of Sun and Moon. The Song of the Vajra is very important for the Dzogchen teaching because it’s like a key for all the methods that we can learn. All the important methods of Dzogchen Semde, Longde and Upadesha are related with the Song of the Vajra. We can learn the Song of the Vajra in three different ways. The first way is through the sound; the sound represents the different functions of our chakras. The second way is through the meaning of the words of the Song of the Vajra. Although there might exist a translation of the words of the Song of the Vajra, it is not so easy to understand it because every word is something like a key, a symbol. The third way is what we call gongpa. In Tibetan the word gongpa means the real condition or state. This three-fold aspect of the Song of the Vajra is related to the three aspects of our existence, namely body, speech and mind. This is similar to what we previously learned about transmission which is three-fold because it relates to the three aspects of our existence. If we communicate or transmit through direct transmission, what we transmit is gongpa. So, we must learn a little through the gongpa state, then we can discover how the Song of the Vajra is really a key for all methods and teachings.