Srila Bhaktisiddhanta Sarasvati Thakura states that without studying Srimad-Bhagavatam one cannot understand the purport of the Brahma-sutra (Vedanta-sutra) or the Upanisads

Expressions researched:
"Śrīla Bhaktisiddhānta Sarasvatī Ṭhākura states that without studying Śrīmad-Bhāgavatam one cannot understand the purport of the Brahma-sūtra (Vedānta-sūtra) or the Upaniṣads"

Sri Caitanya-caritamrta

CC Madhya-lila

Srila Bhaktisiddhanta Sarasvati Thakura states that without studying Srimad-Bhagavatam one cannot understand the purport of the Brahma-sutra (Vedanta-sutra) or the Upanisads.

CC Madhya 25.153, Translation and Purport

Śrī Caitanya Mahāprabhu advised Prakāśānanda Sarasvatī, “Study Śrīmad-Bhāgavatam very scrutinizingly. Then you will understand the actual meaning of the Brahma-sūtra.”

Śrīla Bhaktisiddhānta Sarasvatī Ṭhākura states that without studying Śrīmad-Bhāgavatam one cannot understand the purport of the Brahma-sūtra (Vedānta-sūtra) or the Upaniṣads. If one tries to understand Vedānta philosophy and the Upaniṣads without studying Śrīmad-Bhāgavatam, one will be bewildered and, construing a different meaning, will gradually become an atheist or an impersonalist.