Lieutenant Wittgenstein finished writing his Logico-Philosophical Treatise. He summed up the meaning of this work in his preface: “What can be said at all can be said clearly; and whereof one cannot speak, thereof one must be silent. “The book will, therefore, draw a limit to thinking, or rather—not to thinking, but to the expression of thoughts; for, in order to draw a limit to thinking we should have to be able to think on both sides of this limit (we should therefore have to be able to think what cannot be thought). The limit can, therefore, only be drawn in language, and what lies on the other side will simply be nonsense.”

— Exact thinking in demented times by Karl Sigmund (Page 123 - 124)