One verse

Srimad Bhagavatam 10.14.4

10.14.4

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

śreyaḥ
of supreme benefit
sṛtim
the path
bhaktim
devotional service
udasya
rejecting
te
they
vibho
O almighty Lord
kliśyanti
struggle
ye
who
kevala
exclusive
bodha
of knowledge
labdhaye
for the achievement
teṣām
for them
asau
this
kleśalaḥ
botheration
eva
merely
śiṣyate
remains
na
nothing
anyat
other
yathā
just as
sthūla-tuṣa
empty husks
avaghātinām
for those who are beating

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.