This is an original work.Our nature is Self. It need not be acquired. We have to find the blocks, degenerating factors that interfere with natural effulgence of Self.If such Self knowledge is not there human thinking and so action is limited and perverted. This is quite obvious in daily life.In self-inquiry we identify the factors that interfere with the natural revelation of the Self.With Self knowledge thinking and action will be there but without a center. In contrast in self-ignorance we think and act from a center and so action is incomplete which leads to misery, violence, sorrow, anxiety, fear, ambition, greed.So everybody needs self-inquiry in which there is insight into the structure and function of ego and why its action is incomplete which necessarily leads to misery. As insight is from our total being the action of insight is instantaneous and total in timeless dimension. With that we stop self centered activity and start doing spontaneous activity in which there is freedom and so the action is complete. As life is action and if such action is complete and we are one with the existence and we function from intelligence of existence and not from cunning intelligence of ego.