CC Madhya-lila 20.106 - Brhan-naradiya Purana
Sri Caitanya-caritamrta
CC Madhya-lila
CC Madhya 20.106, Translation and Purport:
“"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."
This verse, quoted from the Nāradīya Purāṇa, is found in the Bhakti-rasāmṛta-sindhu (1.2.103).