CC Madhya 20.106

acirād eva sarvārthaḥ
sidhyaty eṣām abhīpsitaḥ
sad-dharmasyāvabodhāya
yeṣāṁ nirbandhinī matiḥ
Word for word: 
acirāt — very soon; eva — certainly; sarva-arthaḥ — the goal of life; sidhyati — becomes fulfilled; eṣām — of these persons; abhīpsitaḥ — desired; sat-dharmasya — of the path of progressive devotional service; avabodhāya — for understanding; yeṣām — those whose; nirbandhinī — unflinching; matiḥ — intelligence.
Translation: 
“ ‘Those who are eager to awaken their spiritual consciousness and who thus have unflinching, undeviated intelligence certainly attain the desired goal of life very soon.’
Purport: 

This verse, quoted from the Nāradīya Purāṇa, is found in the Bhakti-rasāmṛta-sindhu (1.2.103).