Śrīmad-Bhāgavatam · Text 10.14.4
Who is speaking and story frame
श्रेय:सृतिं भक्तिमुदस्य ते विभो
क्लिश्यन्ति ये केवलबोधलब्धये ।
तेषामसौ क्लेशल एव शिष्यते
नान्यद् यथा स्थूलतुषावघातिनाम् ॥ ४ ॥
śreyaḥ-sṛtiṁ bhaktim udasya te vibho
kliśyanti ye kevala-bodha-labdhaye
teṣām asau kleśala eva śiṣyate
nānyad yathā sthūla-tuṣāvaghātinām
My dear Lord, devotional service unto You is the best path for self-realization. If someone gives up that path and engages in the cultivation of speculative knowledge, he will simply undergo a troublesome process and will not achieve his desired result. As a person who beats an empty husk of wheat cannot get grain, one who simply speculates cannot achieve self-realization. His only gain is trouble.
Read the purport on Vedabase.ioFrom Canto 10, chapter 14 onward, the translation and purports were completed by Śrīla Prabhupāda's disciples after his departure, and published by the Bhaktivedanta Book Trust.