https://truth.prabhupada.org.uk/prabhupada-on-radhanaths-black-face-and-dark-aura
So Krsna consciousness is so nice that naturally it will make you beautiful, not black-faces, not morose–beautiful face. That is the sign of spiritual advancement. By the face you’ll understand that “Here is a man who is spiritually advanced.” Pratyaksam avagamam dharmyam. This process of spiritual consciousness can be directly perceived. It is not theoretical: “Oh, I am a very great devotee.” No. Simply theoretical understanding, “I am a great devotee…” From the very face it will be understood. Face is the index of mind, how you are thinking. If you are thinking of Krsna always, then your face will be beautiful. Therefore it is called pratyaksam avagamam dharmyam, direct perception. There is no theoretical. It is practical. Pratyaksyam avagamam dharmyam su-sukham.
Prabhupada from a Srimad-Bhagavatam Lecture 6.1.32, Surat, December 16, 1970
Therefore, those who have taken to Krsna consciousness, it is my request that you help your countrymen how to become… At least, there must be a section of men first-class so that people will see. They are appreciating. I know that. When I was going from Los Angeles to Hawaii, one priest in plain dress came to see me. He came to…, “Oh, Swamiji, can I speak with you?” “Yes, come here.” So his first question was that “How your disciples look so bright?” They are appreciating that “Here is a first-class man.” So I replied, “The process is so nice. Face is the index of mind. If you become purified within, then your faces will be bright. If you dirty within his heart, how you can be brightened? No, that is not possible. Face is the index of mind.”
Prabhupada from a Srimad-Bhagavatam 6.1.20, Chicago, July 4, 1975
Guest (2): Does any physical change take place in your body when you become Krsna conscious?
Prabhupada: Yes. There are so many physical changes. We have seen it practically. Yes. Some of our students, so long he was here, he was so nice. He was so glowing. And as soon as he has left, he has become just like damn rascal. Yes. We are experiencing practically. There are so many instances. Because my face is the index of mind, so similarly, what is going on within you, that will be reflected. That will be reflected. Caitanya Mahaprabhu was asked that “How can I understand…?” One of His disciples inquired from Caitanya Mahaprabhu, “How can I understand that a man is in Krsna consciousness?” He immediately replied, “If you see a man and at once you remember Krsna, you must know that he is in Krsna consciousness.” It is such a nice thing. By seeing the face, by seeing the appearance of a person, if you remember Krsna, you should know that “This man is in Krsna consciousness.” So there is change of physical feature also.
Prabhupada from a Srimad-Bhagavatam 7.7.22-26, San Francisco, March 10, 1967
