Siddha Gita literally is the song of the emancipated saints. It occurs in the Upshanti Prakarana of Yoga Vasistha (8.1-18). A group of saints met the philosopher king Janaka and declared how they became emancipated. Negation of the subject-object relationship and the expansion of consciousness into infinity form the essence of their exhortation. It is said that Janaka Gita of King Janaka has been inspired by Siddha Gita.
The siddhas say that when seer and seen are seen as the individual Self with the Supreme Self, there would arise the understanding of the Unchanging Self (verse 9).
They declare that they resort to the Self, the light of all lights, which lies between the concepts of ‘is’ and ‘is not’, being the natural center between existence and non-existence (verse 11).
They say that they had resorted to the infinite or True Self, which is everything and which exists in all forms (verse 12-13).
They denounce the man who ignores God that occupies the heart and resorts to an external God (verse 14), who attaches himself to worldly pleasures, through knowing fully their ephemeral nature (verse 16).
They instruct that indriya-ahi, serpents in the form of senses, should be slain by viveka danda (rod of discrimination) and that the effort be directed to realize joy arising from tranquility. He who is tranquil controls his mind, and he who controls his mind rejoices in bliss forever (verse 17-18).