Consider love, as an attribute of God. If God is a mere unity without Trinity, then what is the object of God's eternal love? Himself? But love in the fullest biblical sense by its very nature reaches out to another, not merely to the self. The world? Then God's eternal attribute of love depends on the world; it needs the world. On a Trinitarian basis, however, God's love is both interpersonal and self-contained: God's love is the love among Father, Son and Spirit for one another and it is not dependent on the world... The Trinity guards aseity, for without it, God is relative to the world. The Trinity also guards the personality of God: he is not a blank unity, which would be impersonal. Rather, he is unity of persons.
John M. Frame
Aseity: is the property by which a being exists in and of itself, from itself, or exists as so-and-such of and from itself.
