O Partha, of all the priests, know Me (the Supreme) to be Brihaspati, the Chief. Of all army generals I am Skanda (Kartikeya). Of all collections of water, I am the ocean.
See where all Krishna takes the seeker in recounting the Supreme’s special manifestations! He refers to Brihaspati, the preceptor of Devas, the last word in pronouncing ethical codes for life and actions.
Krishna brings Skanda, the son of Shiva, as the best of army generals. In the full scheme of creation, there is a place for everything from the best to the worst consequently, for conflicts also between them. Thus, any nation, to be stable and cohesive, must have good defence forces under able leaders.
Earth is the planet on which we are born and are living. The land we have is only one-third of the surrounding oceans. Krishna says the Supreme is manifest in the ocean. The true seeker should strive to have an extensive vision resembling the ocean. That too will not suffice. He must embody a space-like mind, capable of assimilating everything life brings and takes away.