Bhagavad Gita 15.3
In this world, its true form is not known, neither its origin nor its end, and its strength is not understood—until the tree, with its roots striking deep into the earth, is hewn down by the sharp axe of non-attachment.
न रूपमस्येह तथोपलभ्यते नान्तो न चादिर्न च संप्रतिष्ठा।अश्वत्थमेनं सुविरूढमूल मसङ्गशस्त्रेण दृढेन छित्त्वा॥na rūpamasyeha tathopalabhyate nānto na cādirna ca saṃpratiṣṭhā|aśvatthamenaṃ suvirūḍhamūla masaṅgaśastreṇa dṛḍhena chittvā||
English translation (above): Shri Purohit Swami (1935), public domain. Sanskrit text via github.com/gita/gita (Unlicense).