V. The Activity of Knowing the World

Whoever is of the view that the entire perceived world is only a mental picture, and indeed the effect upon my soul of things unknown to me, for him the real question of knowledge has to do of course not with the mental pictures which are only present in my soul, but rather with the things which lie beyond our consciousness and are independent of us. He asks how much we can know indirectly about the latter, since they are not directly accessible to our observations. Someone taking this standpoint does not bother himself about the inner connection of his conscious perceptions, but only about their no longer conscious causes, which have an existence independent of him, while, in his view, the perceptions disappear as soon as he turns his senses away from the things. Our consciousness functions, from this point of view, like a mirror, whose images of specific things also disappear the moment its reflecting surface is not directed toward them. Someone, however, who does not see the things themselves, but only their mirror images, must, from the behavior of the latter, inform himself indirectly be inferences about the nature of the former. This is the stand-point of modern science, which uses perceptions only as a last resort to obtain information about the processes of matter which stand behind our perceptions and which alone truly exist. If the philosopher as critical idealist allows any real being to exist at all, then his striving for knowledge, using mental pictures as a means, directs itself only to this real being. His interest skips over the subjective world of mental pictures and goes straight for what produces these mental pictures.