Caitanya-caritāmṛta 25.31
śreyaḥ-sṛtiṁ bhaktim udasya te vibho kliśyanti ye kevala-bodha-labdhaye teṣām asau kleśala eva śiṣyate nānyad yathā sthūla-tuṣāvaghātinām
[shreyah-sritim bhaktim udasya te vibho klishyanti ye kevala-bodha-labdhaye teshaam asau kleshala eva shishyate naanyad yathaa sthoola-tushaavaghaatinaam]
Blended reading (Sanskrit + English inline)
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 only auspicious path. If one gives it up simply for speculative knowledge or the understanding that these living beings are spirit souls and the material world is false, he undergoes a great deal of trouble. He only gains troublesome and inauspicious activities. His actions are like beating a husk that is already devoid of rice. His labor becomes fruitless.’
Purport
This is a quotation from Śrīmad-Bhāgavatam (10.14.4).
— A.C. Bhaktivedanta Swami Prabhupāda
My note
Source: vedabase.io