One verse

Srimad Bhagavatam 3.25.19

3.25.19

न युज्यमानया भक्त्या भगवत्यखिलात्मनि । सद‍ृशोऽस्ति शिव: पन्था योगिनां ब्रह्मसिद्धये ॥ १९ ॥

na yujyamanaya bhaktya bhagavaty akhilatmani sadrso ’sti sivah pantha yoginam brahma-siddhaye

na
not
yujyamanaya
being performed
bhaktya
devotional service
bhagavati
towards the Supreme Personality of Godhead
akhila-atmani
the Supersoul
sadrsah
like
asti
there is
sivah
auspicious
panthah
path
yoginam
of the yogis
brahma-siddhaye
for perfection in self-realization.

Perfection in self-realization cannot be attained by any kind of yogi unless he engages in devotional service to the Supreme Personality of Godhead, for that is the only auspicious path.