Verse
ततः पदं तत्परिमार्गितव्यंयस्मिन्गता न निवर्तन्ति भूयः ।तमेव चाद्यं पुरुषं प्रपद्ये ।यतः प्रवृत्तिः प्रसृता पुराणी ॥
tataḥ padaṃ tatparimārgitavyaṃyasmingatā na nivartanti bhūyaḥtameva cādyaṃ puruṣaṃ prapadyeyataḥ pravṛttiḥ prasṛtā purāṇī
The real form of it cannot be perceived by us in this material world of man’s embodiment, nor its beginning nor its end, nor its foundation; having cut down this firmly rooted Ashwattha by the strong sword of detachment, one should seek for that highest goal whence, once having reached it, there is no compulsion of return to mortal life; I turn away (says the Vedantic verse) to seek that original Soul alone from whom proceeds the ancient sempiternal urge to action.
Gītā 15·4