(Srila Prabhupada at 26 Second Avenue, New York, 1966)
"Now, people say that 'Whether God can be seen? If anyone has seen God?' Yes, God can be seen. There is no doubt about it. But it requires some qualifications. Not some, but only one qualification. God is so kind that He does not require any material qualification. He does not require that you should be very learned man, very beautiful, or very rich man, or a king or emperor or minister or president, no, nothing of the sort. You can be anything. But only one qualification required. Then you can see God. What is that qualification? (Sings:)
santaḥ sadaiva hṛdayeṣu vilokayanti
That qualification is unalloyed love. That's all. One who has achieved that unalloyed, unalloyed love for God... Unalloyed love means without any tinge of philosophical speculation or fruitive activity. That's another subject. It requires great explanation. But unalloyed love means without any tinge of material color. That is called unalloyed. Even philosophical speculation or fruitive activities, if it is offered to the Supreme Lord, that is not love. Love is above this. So if one can achieve that unalloyed love for God, with that, I mean to say, magic wand, the eye becomes eligible for seeing God. Premāñjana-cchurita-bhakti-vilocanena. And that, that eye, is called devotional eye, devotional. We have to... Not only eyes, but every part of our body, we have to spiritualize by the contact.
By the contact of spiritual service in devotion of the Lord, we can gradually spiritualize our whole act of senses. Just like a iron rod put into the fire. Gradually the temperature rises. It becomes warm, warmer, warmest, very hot, then red hot. When it is red hot, then it is no longer iron; it is fire. Similarly, by our contact in devotional service of the Lord we can change the whole position of our material existence. And we have... If we have developed to that state of unalloyed love for God, then God can be seen twenty-four hours, not that once seen and again not seen. No. This is described here, that santaḥ, the great devotees, unalloyed devotees, who are liberated souls, have no connection with material activities or philosophical speculation, such unalloyed devotees, because their eyes are smeared with the ointment of love only, therefore they can see the Lord sadaiva, always, twenty-four hours."
(Srila Prabhupada Lecture, New York, November 5, 1966)