Krishnadas Kaviraj Goswami explains, in this world there are three substances that are extraordinarily powerful:
One is the water that washes the feet of the great vaisnava.
Two is the dust from the feet of a great vaisnava.
Three is the food remnants of the great vaisnava.
And Krishnadas Kaviraj Goswami declares that these three substances are maha bhava, supremely greatly powerful and one should obtain them by any means possible. Hari Bol Nitai Gaur Premanandi