A Forgotten Stream in German Spiritual Life

One can absolutely perceive in Planck's soul a similar kind of feeling for the riddle of knowledge as that revealed in the other thinker personalities characterized in this book. This riddle in its original form becomes for Planck the point of departure for his investigations. Within the circumference of the human thought-world can the strength be found by which man can apprehend true reality, the reality that gives his existence sense and meaning within world existence? Man sees himself placed into and over against nature. He can certainly form thoughts about what rules in nature's depths as powers of true being; but where is his guarantee that his thoughts have any significance at all other than that they are creations of his own soul, without kinship to those depths? If his thoughts were like this, then it would in fact remain unknown to man what he himself is and how he is rooted in the true world. Planck was just as far as Hegel from wanting to approach the world depths through any soul force other than thinking. He could hold no other view than that genuine reality must yield itself somehow to thinking. But no matter how far one reaches out with thinking, no matter how one seeks to strengthen its inner power: one still remains always only in thinking; in all the widths and depths of thinking one does not encounter being (Sein). By virtue of its own nature, thinking seems to exclude itself from any communion with being. Nevertheless, this insight into thinking's alienation from being now becomes for Planck precisely the ray of light that falls upon the world riddle and solves it. If thinking makes absolutely no claim of bearing within itself anything at all in the way of reality, if it actually is true that thinking reveals itself to be something unreal, then precisely through this fact it proves itself to be an instrument for expressing reality. If it were itself something real, then the soul could weave only in its reality, and could not leave it again; if thinking itself is unreal, then it will not disturb the soul through any reality of its own; by thinking, man is absolutely not within any thought-reality; he is within a thought-unreality that precisely therefore does not force itself upon him with its own reality but rather expresses that reality of which it speaks. Whoever sees in thinking itself something real must, in Planck's view, give up hope of arriving at reality; since, for him, thinking must place itself between the soul and reality. If thinking itself is nothing, it can therefore also not conceal reality from our activity of knowing; then reality must be able to reveal itself in thinking.