न रूपमस्येह तथोपलभ्यते नान्तो न चादिर्न च संप्रतिष्ठा। अश्वत्थमेनं सुविरूढमूल मसङ्गशस्त्रेण दृढेन छित्त्वा ॥

na rūpam asyeha tathopalabhyate nānto na chādir na cha sampratiṣhṭhā aśhvattham enaṁ su-virūḍha-mūlam asaṅga-śhastreṇa dṛiḍhena chhittvā

Nor here may be acquired knowledge of its form, nor its end, nor its origin, nor its rooting-place; this strongly rooted Asvattha having been cut down by the unswerving weapon of non-attachment,

In plain words: Krishna says no one in this world can see the tree's true shape, its beginning, its end or where it is rooted. Still, this deep-rooted tree must be cut down with the strong axe of non-attachment, which means not clinging to things.