If one considers oneself to be a Vajrayana practitioner

"A teaching on Seven Line Song is only valuable if it is seen to be valuable. It cannot be seen as being valuable outside the context of Vajrayana practice. If one considers oneself to be a Vajrayana practitioner, then Dorje Tsigdun will have a depth of felt importance before a word of teaching has been uttered. This is important, because if one has the right attitude it is even possible to gain some further understanding of Dorje Tsigdun from a deranged dolt like Ngakpa Chögyam. There are some aspects of this teaching which may appear simple or quite meaningless, if they are not understood through the emotional charge of devotion. You could try to hear this teaching in the ambience of the devotion you feel for your own Lamas and the traditions they hold."

Seven Line Song, Ngak'chang Rinpoche, Aro Encyclopaedia

Hung

"Hung is the heart syllable, the seed syllable of Padmasambhava. Hung is also the seed syllable of Yeshé Tsogyel. Hung is the primordial union of emptiness and form; the understanding of which, in itself, encompasses refuge and bodhicitta. There is no refuge and bodhicitta greater than the comprehension of the non-duality of emptiness and form."

Seven Line Song, Ngak'chang Rinpoche, Aro Encyclopaedia

Ögyen yul-gi nub-chang tsam

"Ögyen is a name of a land. It is also a term which is used to indicate the origin of Vajrayana. Ögyen yul is an epithet for sem-nyid (sems nyid) – the nature of Mind. The word ‘tsam’, the last word of the first line of the Dorje Tsigdun, means juncture – the point instant of discovery. In common terms—according to mundane understanding, and with reference to our previous discussion—Ögyen yul, this green and pleasant land, is the place where we find what we have lost – the non-dual state."

Seven Line Song, Ngak'chang Rinpoche, Aro Encyclopaedia

Dorje Tsigdun

"From the point of view of Dzogchen we have to know how to practise essentially. We have to have some sense of how to maintain a stream of practice through our lives, through illness, and through each different circumstance that may arise. Dorje Tsigdun is valuable in this respect, because it contains everything that is required."

Seven Line Song, Ngak'chang Rinpoche, Aro Encyclopaedia

Seven-Line Song

"Seven-Line Song is sometimes called Seven-Line Prayer/Tsig-dun Soldep, or Dorje Tsig-dun/Seven Thunderbolt Phrases. We both sing and chant Seven-Line Song. When one practices it as Song, one finds the presence of awareness in the dimension of sound."

Compassion & The Nine Yanas, Ngak'chang Rinpoche, Aro Encyclopaedia