The witness (drasta), looks on passively but consciously, with acute alertness. It never participates in that which is looked at. It stands aloof and separate, a step away, as it were. The seen is 'there' and not 'here'. See the mind in operation. It is drsya, you are drasta. Look at it, don't deny or assert.
As a street lamp illuminates whatever passes under it, be it a marriage party or a funeral procession, and it also shines on itself when there is nothing else to illuminate, even so there is a conscious base in us, on which the three states- walking, dream and deep sleep- play about. They come and go, but the base remains as it is. If it were not so, my dream experience could not remain with me. As a thread in a garland keeps the flowers together, so too, my walking, dream and sleep experiences keep hanging on to the 'I'. If the 'I' too were to change, who would have these experiences as a connected whole?
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सिद्धयसिद्धयोर्निर्विकार: कर्ता सात्त्विक उच्यते ॥१८.२६॥
Freed from attachment, non-egoistic, endowed with courage and enthusiasm and unperturbed by success or failure, the worker is known as a pure (Sattvika) one. Four outstanding and essential qualities of a worker. - Bhagwad Gita : XVIII-26