PURPORT

This gradual process of evolution suggests the explanation of the controlling deities (adhidaiva) because Varuna is the controlling deity for all relishable juices. Therefore the mouth becomes the resting place for the tongue, which tastes all the different juices of which the controlling deity is the Varuna. It suggests, therefore, that Varuna was also generated along with the development of the tongue. The tongue and the palate, being instrumental, are adhibhutam, or the forms of matter, but the functioning deity who is a living entity is adhidaiva, whereas the person undergoing the function is adhyatmic, and thus the three categories are also explained as to their birth after the opening of the mouth of the virata purusa. The four principles mentioned here in this verse serve to explain the three main principles, namely the adhyatma, adhidaiva and adhibhutam, as explained before.