The intellect is also called by the name of faculty of discrimination. If in the science of the powers of this faculty we place ourselves on the standpoint of present-day natural knowledge, we possess the clear and plain insight that there are no exaggerated distinctions, no unrelated extremes, in the universe. The infinite is related to the finite. For all developed and perishable things are the direct offspring of the imperishable, of the eternal universe. General nature and its special parts are inseparably interlaced. There is nothing among all that has a name which is fundamentally different from other things known by name. There will hardly be any objection against these sentences, until we proceed to draw their last consequences. If all things are related and without exception children of the universe, it follows that mind and matter must also be two yards of cloth from the same piece. Hence the difference between human understanding and other natural human faculties must not be magnified into that of irreconcilable extremes. In order to become accustomed to scientific distinctions, the reader should consider that a man can remain under the sway of a belief in ghosts only so long as he ignores the relationship of all existing things. He believes in real ghosts whose reality is supposed to be radically different from his own. Such a distinction is exaggerated and illogical, and whoever believes in it does not know how to discriminate scientifically and has not the full use of his critical faculties. Just as common parlance opposes art to nature and then forgets that art is a part of nature, similarly as night is a part of day, so the language of the believer in ghosts does not know that reason and wood, mind and matter, in spite of all their differences, are two parts of the same whole, two expressions of the same universal reality. Everything is real and true, because in the last instance the universe is all, is the only truth and reality. So I call it a slip of the tongue to speak of natural nature as opposed to natural art or artificial nature, of imaginary reality as distinct from real reality. There ought to be a different name for the day of twelve hours than for the day of twenty-four hours, so that it might be better understood that day and night are not fundamentally different, but two prongs of the same fork.