Sensations, looked at not as to what they represent, but in themselves, are impulses. As such they constitute the lowest stage of will. Impulsive action then includes all such as occurs for an end which is unknown, or at best but dimly felt. Such action may be called blind, not in the sense that it is without reason, but in the sense that reason is not consciously present. We are not to think of this instinctive action, however, as if it were found simply in the animals. Much of human action is also impulsive; probably, indeed, an impulsive factor is contained in our most rational willing. We are never able to take complete account of the agencies which are acting upon us. Along with the reasons of which we are conscious in choosing, there are mingled faint memories of past experience, subconscious solicitations of the present, dim expectations for the future. Such elements are decisive factors far more than we realize. Indeed, it is because of the extent to which such unconscious influences bear upon us and move us that there arises the idea of indifferent or unmotivated choice. Were both motive and choice unconscious, the question as to whether choice were antecedently determined would not arise; and were our motives and their results wholly in consciousness, the solution of the question would be evident. But when we are conscious of our choice, but are not conscious of our impulses and motives, we get the impression that our choice is unmotived, and hence come to believe in "indifferent freedom,"--the ability to choose as we will. We shall shortly take up in more detail the theory of Leibniz regarding the freedom of will; and it is needful here to remark only that the conception which makes it consist in ability to choose without reason is in direct contradiction to his fundamental thought,--namely, that there can be no activity which does not aim at some reflection of the universe, by which, therefore, it is determined. From the psychological point of view, it is interesting also to notice how Leibniz's theory of unconscious ideas enables him to dispose of the strongest argument for indifferent choice,--that drawn from the immediate "testimony" of consciousness.