Bhagavad Gita 15.3

न रूपमस्येह तथोपलभ्यते नान्तो न चादिर्न च सम्प्रतिष्ठा |
अश्वत्थमेनं सुविरूढमूल मसङ्गशास्त्रेण दृढेन चित्त्वा

Translation

The real form of this tree is not perceived in this world, neither its beginning nor end, nor its continued existence. But this deep-rooted aśhvatth tree must be cut down with a strong axe of detachment.