Bhagavad Gita 2.42

Only the ignorant speak in figurative language; it is they who extol the letter of the scriptures, saying, "There is nothing deeper than this."

यामिमां पुष्पितां वाचं प्रवदन्त्यविपश्चितः।
वेदवादरताः पार्थ नान्यदस्तीति वादिनः॥

yāmimāṃ puṣpitāṃ vācaṃ pravadantyavipaścitaḥ|
vedavādaratāḥ pārtha nānyadastīti vādinaḥ||

English translation (above): Shri Purohit Swami (1935), public domain. Sanskrit text via github.com/gita/gita (Unlicense).