This is the divinity of the Personality of Godhead: He is not affected by the qualities of material nature, even though he is in contact with them. Similarly, the devotees who have taken shelter of the Lord do not become influenced by the material qualities.
The most secret portions of the Vedic texts declare Krishna as the Supreme Personality of Godhead.
Lecture on "Srila Prabhupada's influence in India" – Bahrain – 25th OCT'06
My Lord, if one is favored by even a slight trace of the mercy of your lotus feet, he can understand the greatness of your personality.
Performing kirtana and hearing the vibration of the sound Hare Krishna is actually seeing the Supreme Personality of Godhead directly.
Purport on Srimad Bhagavatam 7.4.25-26
One who performs his duty without attachment, surrendering the results unto the Supreme Lord, is unaffected by sinful action, as the lotus leaf is untouched by water.
Our first duty is to satisfy the spiritual master, who can arrange for the Lord’s mercy. A common man must first begin to serve the spiritual master or the devotee. Then, through the mercy of the devotee, the Lord will be satisfied. Unless one receives the dust of a devotee’s lotus feet on one’s head, there is no possibility of advancement. Unless one approaches a pure devotee, he cannot understand the Supreme Personality of Godhead.