jivan chavo bhagavatanghri-renum
na jatu martyo ‘bhilabheta yastu
sri-visnu-padya manujas tulasyah
svasan chavo yas tu na veda gandham
The person who has not at any time received the dust of the feet of the Lord’s pure devotee upon his head is certainly a dead body. And the person who has never experienced the aroma of the tulasi leaves from the lotus feet of the Lord is also a dead body, although breathing.
PURPORT by Srila Prabhupada
According to Srila Visvanatha Cakravarti Thakura, the breathing dead body is a ghost. When a man dies, he is called dead, but when he again appears in a subtle form not visible to our present vision and yet acts, such a dead body is called a ghost. Ghosts are always very bad elements, always creating a fearful situation for others. Similarly, the ghostlike nondevotees who have no respect for the pure devotees, nor for the Visnu Deity in the temples, create a fearful situation for the devotees at all times. The Lord never accepts any offerings by such impure ghosts. There is a common saying that one should first love the dog of the beloved before one shows any loving sentiments for the beloved. The stage of pure devotion is attained by sincerely serving a pure devotee of the Lord. The first condition of devotional service to the Lord is therefore to be a servant of a pure devotee, and this condition is fulfilled by the statement “reception of the dust of the lotus feet of a pure devotee who has also served another pure devotee.” That is the way of pure disciplic succession, or devotional parampara.