। ॥ ६१३ ॥
In plain words
There is always the unbroken recognition 'I have always existed,' and never at any time the thought 'I did not exist.' From this, the eternal nature of the Self is established.
Close to the Sanskrit
An identical cognition 'I was at all times' is seen, never 'I was not at any time'; from this, the eternity of the Self is established.