The slightest self-observation must show every one a remarkable difference between the various immediate conditions of his consciousness, which we may also call representations. For some of them appear altogether dependent upon our freedom, and we cannot possibly believe that there is without us anything corresponding to them. Our imagination, our will, appears to us as free. Others, however, we refer to a Truth as their model, which is held to be firmly fixed, independent of us; and in determining such representations, we find ourselves conditioned by the necessity of their harmony with this Truth. In the knowledge of them we do not consider ourselves free, as far as their contents are concerned. In short: while some of our representations are accompanied by the feeling of freedom, others are accompanied by the feeling of necessity.