Just as all trees grow and spread according to the nature of their species and they cannot impose their influence on others but a sandalwood tree can make all other trees smell like itself.
Just as addition of some special chemical in copper. can convert it into gold, but all metals can become gold by the touch of a philosopher-stone.
Just as the flow of many rivers is different in many ways, but their water becomes pure and sacred once they mingle with water of river Ganges.
Similarly, none of the gods and goddesses change their basic character. (They can reward someone according to their nature). But like sandalwood, philosopher-stone and river Ganges, the True Guru takes all under his refuge and blessing them with Naam Amri