The aim of life is to love Krishna. It is not necessary to know how Krishna is God. Just like the child loves mother and father. The child has no knowledge of what is or how it is that the parents are mother and father. It is simply love.
Love of Krishna automatically includes all lower departments of understanding, philosophy, mystic power, sense gratification, liberation and knowledge, but the afore-mentioned items themselves do not contain love of God. Nor are they helpful to love God. In fact, they are detrimental.
Our aim is simply to love God.