unerring intuition; the ascent must be slow, with constant dangers of stumbling, even of falling headlong. To these dangers must be added his latent likes and dislikes, which imperceptibly guide his thought, especially in forming opinions on questions of the world and of life, which the human heart cannot view with indifference: they influence his thought. Hence ignorance, darkness, and error, everywhere accompany the [pg 007] investigator individually, and science as a whole, all the more the loftier the questions that present themselves.
Already the philosopher of the dim past gave expression to the complaint, that our reason is no more capable of knowing the divine than the eyes of the owl are of seeing in broad daylight. It is Aristotle who so complains. And the great Newton, in the evening of his life, thus estimates the worth of his knowledge: “What the world may think about my labour, I do not know; I feel like a child that plays on the strand of the sea: now and then I may perhaps find a pebble or shell more beautiful than those of my playmates, while the boundless ocean lies ever before me with its undiscovered treasures” (apud O. Zoeckler, Gottes Zeugen im Reich der Natur (1906), 173). The same sorrowful plaint is heard from all serious investigators, especially those in the domain of the natural sciences, who should have more reason than others to be proud of their achievements. “However great the amount of human knowledge may seem to the multitude,” writes the well-known chemist Schoenbein, “the most experienced scientist feels the incompleteness and patchwork of it, and realizes that man so far has been able to learn but infinitely little of what nature is, and of what can be known.” “The more exact the investigation,” says the geologist Quenstedt, “so much the more obscure is its beginning. Indeed, the deeper we think to have understood the single parts, the further the original plan of the Creator seems to escape us” (cf. Kneller, Das Christentum und die Vertreter der neueren Naturwissenschaften (1904), 208, 281). “Although science,” so we are assured by another modern savant, “has brought to light many a treasure, still, compared with what we do not yet know, it is as a drop to the ocean. In all our knowledge there will always be the danger of error.” We are probably not very far in advance of the time of Albrecht von Haller, who said: “We, all of us, err, only each errs in a different way. Every passage that has been illuminated by science is surrounded by dense darkness; beyond the visible lies the invisible.” And Prof. J. Reinke continues: “As early as the day of Socrates, the beginning of philosophy was to know that we know nothing; the end of philosophy, to know that we must believe: such is the inevitable fate of human wisdom” (Naturwissenschaft und Religion, in Natur und Kultur IV (1907), 418, 425. Printed also separately). Some years ago Sir W. Ramsay, a noted scientist, concluded a discourse on his scientific labour with the words: “When a man has reached the middle of his life, he begins to believe that the longer he lives the less he knows! This is my excuse for having molested you for an hour with my ignorance” (Einige Betrachtungen ueber das periodische Gesetz der Elemente. Vortrag auf der 75. Versammlung Deutscher Naturforscher und Ærzte zu Cassel (1903)).
If science, then, can only with difficulty lift from visible nature the veils that hide the truth—and even this is often beyond its power—no wonder it is confronted with still greater obstacles when it approaches the truths that are beyond visible nature. Moreover, it is an old truth that here it is led not by reason only, but also, and even more energetically, [pg 008]by self-interest. “Most men,” says Cicero, “are swayed in their judgments by either love or hatred, likes or dislikes” (De Oratore, II, 42).
If this is the nature of human science, its adepts would be badly deceiving themselves, if, in the pride of learning, they would reject every correction, even proudly pushing aside the hand of God that reaches down into the darkness of man's intellectual life to offer its guidance. He who realizes that he is in danger of losing his way in the dark, will not reject a reliable guide; and he who fears to stumble will not refuse a helping hand. Self-knowledge is the sister of wisdom, and the mother of modesty.
Freedom.
Such, then, is science: not the goddess that emanated from the head of immortal Jove, but the offspring of the puny mind of man, bone of his bone and flesh of his flesh. And this science cries for freedom. It would be free and act freely; it urges its claim in the name of truth, which must not be slighted; in the name of the progress of civilization, which must not be hindered.
Freedom clearly means nothing less than to be untrammeled and free from restraint, from fetter and check, in action, thought, and desire. The prisoner is free when his chains drop off, a people is free when it has cast off the yoke of serfdom, the eagle is free and can spread out its wings in lofty flight when not bound down to the earth. Science, therefore, should be free in its activity from bond, fetter, and restraint. Does this mean it must be free from all restraint and law? Should the historian be given the right to make Solon a member of the French Academy, or of the heroes of Troy mediæval knights? Should the scientist be given the right to break every rule of logic, to ignore all progress, and perhaps in his capriciousness return to the four elements of Aristotle, or the astronomical chart of primitive ages? Nobody demands this. No, science must be bound by the truth. Freedom indeed should not mean lawlessness. Science remains bound by the general laws of logic, and by positive facts. Truth is the irremovable barrier set in restraint [pg 009] of the freedom of everything, even of scientific thought. The freedom of science therefore can only be freedom from unreasonable restraint and fetters; from such that hinder it unreasonably in its inquiry after the truth, and in the communication of the results of its investigation. It should be free, not from the internal bondage of truth, but from the restraint by external authority, the restraint which would hinder it, in an improper way, from approaching those questions, and using those methods, that lead to the discovery of truth, and from acknowledging the results it has found to be true; or which would unlawfully keep it from making known, for the benefit of others, the results of its investigation. It should be free from any unjust restriction, imposed by state or Church, by popular opinion, by party spirit, by hampering protectorate, or servility of any kind.
From any unjust restriction, we said. For this is clear: if under certain circumstances there might be warrant for a just restriction by external authority, such a restriction could not be refused in the name of freedom. So long, then, as we understand by freedom a lawful freedom, there cannot be included in this the freedom from every external authority, but only from unlawful interference. There is, then, the question whether there may be a legitimate restraint, imposed by external authority, which man must not evade, and what the nature of such restraint may be.
We must, moreover, take into consideration two elements, which are distinguished in the above definitions, both belonging to the modern idea of scientific freedom. We will call them freedom of research, and freedom of teaching. The investigator and the scientist claim the one; the teacher, the other. Searching after truth, and communicating the truth found, are, as is known, the principal occupations of science. The scientist should first of all be an investigator. He should not be content to appropriate to himself the knowledge of others, he should also make his own additions to knowledge. He is also commonly a teacher, by word of mouth, as at the university, or by his writing, in his literary activity. Research, as such, imparts directly a certain knowledge only to the investigator; [pg 010] it is of a private nature and as such does not reach beyond him. But by teaching, his ideas are communicated to others, and then begin to influence their thought, will, and action, often very strongly. Teaching is a social factor; with it are bound up the weal and woe of others. Suppose a man of influence conceives in his study the idea that monogamy is an infringement upon the universal rights of man; should he be given without any ado the right of disseminating, by teaching, the imagined results of his investigation, to the confusion of men, and with serious danger to the peace of society?
We shall therefore have to distinguish between freedom of research and freedom of teaching. The neglect of this distinction causes not a little confusion; thus, if one complains of his convictions being trammeled
