SB 3.32.23

It is said by less intelligent class of men that bhakti-yoga or devotional service is meant for persons who are not advanced in the method of transcendental knowledge and renouncement. But actually the fact is that if one is in full Krsna consciousness and engaged in devotional service of the Lord, he hasn't got to attempt separately to practice detachment or to wait for awakening of transcendental knowledge. It is said that one who is engaged unflinchingly in the devotional service of the Lord, actually all the good qualities of the demigods develop into him automatically. One cannot find out any reason how such good qualities develop in the body of a devotee, but actually it happens. There are many instances in the history. Just like the hunter who was taking pleasure in killing animals, and when he became a devotee he was not prepared to kill even an ant. Such is the qualification of a devotee.

In other words, those who are very much eager to advance in the matter of transcendental knowledge, they can engage themselves in pure devotional service without wasting their time in mental speculation to arrive at the positive conclusion of the knowledge of the…, of the Absolute Truth. Here in this verse, the word brahma-darsanam is significant. Brahma-darsanam means to realize or to understand the Transcendence. So one who is engaged in the service of Vasudeva, he can actually really realize what is Brahman. The darsanam, if Brahman is impersonal, then there is no question of darsanam. But when... Darsanam means to see face to face. So therefore darsanam means to see the Supreme Personality of Godhead, Vasudeva. Unless the seer and the seen are person, there is no question of darsanam. So brahma-darsanam, as soon as one sees the Supreme Personality of Godhead, he can at once realize what is impersonal Brahman. Such devotee doesn't require to make separate attempt to understand what is Brahman. The Bhagavad-gita [Bg 14.26] also confirms this: brahma-bhūyaya kalpate-he at once become a self-realized soul in the Absolute Truth.