[30] What, then is a percept? The question, asked in this general way, is absurd. A percept emerges always as something perfectly definite, as a concrete content. This content is directly given and is completely contained in what is given. The only question one can ask concerning the given content is what it is apart from perception, that is, what it is for thinking? The question concerning the "what" of a percept can, therefore, only refer to the conceptual intuition that corresponds to this percept. From this point of view, the question of the subjectivity of percepts, in the sense of critical idealism, cannot be raised at all. Only what is perceived as belonging to the subject can be termed "subjective." To form a link between something subjective and something objective is impossible for any process that is "real" in the naïve sense, that is, one that can be perceived; it is possible only for thinking. Therefore what appears for our perception to be external to the percept of myself as subject is for us "objective". The percept of myself as subject remains perceptible to me after the table which now stands before me has disappeared from my field of observation. The observation of the table has produced in me a modification which likewise persists. I retain the faculty to produce later on an image of the table. This faculty of producing an image remains connected with me. Psychology calls this image a memory-picture. It is in fact the only thing which can justifiably be called the mental picture of the table. For it corresponds to the perceptible modification of my own state through the presence of the table in my visual field. Moreover, it does not mean a modification of some "Ego-in-itself" standing behind the percept of the subject, but the modification of the perceptible subject itself. The mental picture is, therefore, a subjective percept, in contrast with the objective percept which occurs when the object is present in the field of vision. Confusing the subjective percept with the objective percept leads to the misconception of contained in idealism -- that the world is my mental picture.

[31] Our next task must be to define the concept of "mental picture" more closely. What we have said about it so far does not give us the concept of it but only shows us whereabouts in the perceptual field the mental picture is to be found. The exact concept of mental picture will make it possible for us also to obtain a satisfactory explanation of the way that mental picture and object are related. This will then lead us over the border line where the relationship between the human subject and the object belonging to the world is brought down from the purely conceptual field of cognition into concrete individual life. Once we know what to make of the world, it will be a simple matter to direct ourselves accordingly. We can only act with full energy when we know what it is in the world to which we devote our activity.