These two doctrines are in a sense the exact antithesis of one another. They agree together in this, that in each the explanation of error follows as a consequence of the conception of the nature of truth. The pragmatist theory implies that there is no truth in any real sense, but only more or less successful error. The idealist theory implies that there is no real error, but only a variety in the degree of truth. {81} Most people, however, are convinced that truth and error are not related to one another, nor to the circumstances that call forth belief or disbelief. Let us now examine a theory that recognises this. There are false judgments, and they need explanation; error has a nature of its own. If a judgment is false, it is absolutely and unalterably false; if it is true, it is unconditionally true and with no reserve. No logical process, no psychological disposition, can make what is false true. Error must lie in the nature of knowledge, and to discover that nature we must understand the theory of knowledge and determine the exact nature of the mental act in knowing. The first essential is to distinguish the kind of knowledge to which truth and error can apply. We pointed out in the second chapter that all knowledge rests ultimately on immediate experience. In immediate experience the relation between the mental act of knowing and the object that is known is so simple that any question as to truth or error in regard to it is unmeaning. To question the truth of immediate experience is to question its existence; it is to ask if it is what it is, and this is plainly unmeaning. But thinking, we said, is questioning experience in order to know its content or meaning, and in thinking, the simplicity of the relation which unites the mind to its object in immediate experience is left behind, and a logical process of very great complexity takes its place. It is in this complexity that the possibility of error lies.