Verse 53

भवभावनया हीनं भावाभावदशोज्झितम् ।भावयन्नेवमात्मानमात्मसंस्थः स्वयं भव

In plain words

Contemplating thus your ātman as free of the very conceiving of becoming, as having cast off the states of existing and of not existing -- abide, of yourself, established in ātman.