It really is all about Love.

Before the following is read it must be understood that Brahman is Paramātman. The highest realization is realizing Self is One without a second; that there is only Oneself veiling itself as Life diversified not to be alone, for Companionship, Friendship, the feeling of Togetherness, Yes, To Love and Be Loved in return. Life is not Life but Self perceiving itself as Life diversified not to be alone. Aloneness aka loneliness is the cause and Love aka Companionship is the purpose of Self (Life). The answer to the question - what is the difference between Paramātman (परमात्मन्) and Ātman (आत्मन्) - is ultimately none for it is Paramātman which veils itself as Ātman to Love and Be Loved in return. Just as the metaphor goes about the drops being the water and the water being the drops; so it goes for Paramātman and Ātman, i.e., Ātman is Paramātman experiencing itself as Ātman not to be alone, to experience Companionship, to Love and Be Loved in return. When Ātman realizes it is Paramātman, Mokṣa is achieved, or rather, Ātman realizes its true Self is Deathless, Eternal and Everlasting for that which is Self is indeed The Eternal One (TEO). In theological terms we could thus state that the correct definition of Teo is thus 'God gifts itself Life for Life is God experiencing itself as itself.' In conclusion: The meaning of Life is Love.
~ Wald