The Freedom of Science

by Josef Donat

But have we here not at least a wilful attack on science? or a manifestation of the Congregation's narrow-mindedness and ignorance, which are bound to deprive it of all respect and confidence of sober-minded people?

This harsh judgment overlooks two points. In the first place, the error of the judges was quite pardonable. Could the liberal critics of to-day, who so harshly denounce the Cardinals of the Congregation, be suddenly changed into ecclesiastical prelates, and transferred back to the years of 1616-1633, and placed in the chairs of the tribunal which had to decide those delicate questions, it may be feared that, did they carry into the decision but a part of the animosity they now show, they would disgrace themselves and compromise the Church even more than the judges of Galileo did. It is true that were we to judge the handling of the question by the knowledge of to-day, we might be astonished at the narrow-mindedness of the judges, trying to uphold their untenable views against the established results of scientific research. But it would be altogether unhistorical to look at the matter in that way. When [pg 191] the Copernican theory entered upon the battlefield, it was by no means certain and demonstrated.

The real arguments for the rotation of the earth were not then known. There were no direct proofs for the progressive revolution of the earth around the sun. Galileo advanced three main arguments for his theory. First, he advanced the argument from the phenomenon of the tides, which, he said, could not be accounted for but by the rotation of the earth: an argument rejected as futile even at that time. Next he argued from certain observations of the spots on the sun: another worthless argument, which others, like Scheiner, looked upon as proof of the older theory. The third argument was that the new theory simplified the explanation of certain celestial phenomena; but the scope of this argument, valid though it was in the abstract, could not be expressed or grasped at the time, especially since the corrections of Tycho de Brahe had removed the greatest objections to the Ptolemaic system. The Copernican theory could not be considered certain till the end of the seventeenth century, after Newton's work on gravitation.

Then there were difficulties, the greatest of which was probably the old idea of inertia, which at that time meant only that all bodies tend to a state of rest; hence it seemed impossible that the earth could ceaselessly execute two movements at the same time, around the sun and around its own axis. This notion of inertia had not been doubted in 1616; even Kepler adhered to it. Later on Galileo came very near to the new idea of inertia: that bodies tended to retain their state of repose or motion. But this new notion, like everything else new, gained ground but slowly. Then it was only with great difficulty that he could dispose of the objection that were the earth to speed through space, as the new theory claimed, the atmosphere would take a stormlike motion. Lastly, the philosophical objection had to be met: the sun and other celestial bodies, as far as we can know by observation, are moving; if they do not move, then we must admit that we can know nothing by observation.

Thus the new doctrine was not at all proven at that time, as could be easily shown by its opponents; although it cannot be denied that they did not always enter into the discussion with impartiality. The astronomer, Secchi, testifies that “none of the real arguments for the rotary motion of the earth was known at Galileo's time, also direct proofs for the progressive movement of the earth around the sun were lacking at that time” (Grisar, 30). Another famous astronomer, Schiaparelli, writes: “In the sixteenth and seventeenth centuries the Ptolemaic as well as the Copernican system could serve for the description of phenomena; geometrically they were equivalent to each other and to Tycho's eclectic system” (Schiaparelli, Die Vorläufer des Copernicus im Altertum (German, 1876), 86).

Hence no direct evidence could be pleaded against the decision of the Congregation, not even Galileo had that evidence. At any rate no judge who observed his demeanour at the trial could have suspected Galileo of coming in conflict with his conscience by swearing off the theory.

For this reason it would be wrong to call Galileo a martyr for science, because he did not suffer any martyrdom. He has seen neither rack nor prison. But he was not a martyr chiefly for the reason that he could not have had any scientific conviction, apart from the fact that he did not claim any such conviction, even denied it expressly.

No wonder, then, that the heliocentric system had considerable opponents at that time; no wonder the opposite view was even the prevalent one. A. Tanner wrote in 1626: “Ita habet communis ac certa omnium theologorum ac philosophorum naturalium sentia” (Theol. Schol. I, disp. 6, q. 4., dub. 3). Had valid argument been brought forth there never would have been a Galileo case. In this respect a passage from a letter of Bellarmin deserves attention: “If it could be really demonstrated that the sun be in the centre of the world ... then we would have to proceed quite cautiously in explaining the apparently opposite passages in the Scriptures, we would rather have to say that we do not understand them, than to say of things demonstrated that they are false” (to Foscarini, April 12, 1615). The Cardinals of that time could not be expected to anticipate the knowledge of a later period. They had to consult the judgment of their contemporaneous savants. When seeing the majority of them sharply rejecting the new theory and refuting the arguments of their opponents, it is little wonder that the Cardinals could not overcome their theological scruples.

The scruples arose from the opinion, then prevalent, that the Holy Scripture taught that the earth stood still and the sun moved; that the words of the Scripture must be taken literally till the contrary is demonstrated. The unanimous explanation of the Christian centuries was also cited. As a matter of fact, however, the Christian past had not taught this to be the only true sense of the words, but at that time the words were understood that way, because no one could arrive at any other sense in those days.

Under these circumstances, an error was hardly avoidable, if a decision was required. And a decision seemed to be urgent, and this is the second point we must not overlook, if we wish [pg 193] to judge fairly. It was a time eager for innovations, full of anti-religious ideas. A renaissance, sidling off into false humanism, was combating religious convictions, false notions were invading philosophy; in addition, Protestantism was trying to invade Italy. All this caused suspicion of any innovation apt to endanger the faith; interpretations of the Scriptures deviating from the accustomed sense were particularly distrusted. The Galileo quarrel happened at an inopportune time. Indeed a sudden spread of the Copernican theory might have been accompanied by great religious dangers. Even now, after nearly three hundred years, the leaders of the anti-Christian propaganda are still pointing out that the progress of natural science has proved Holy Scripture to be erroneous, and many are impressed by the argument; many thousands would have been confused in those days by the sudden collapse of old astronomical views that were connected with unclarified religious ideas—dreading that victorious science might shatter all religious traditions. Now, if one is convinced that the damage to religion is to be estimated greater than any other, then one may also have the conviction that it was better for the nations of the new era to have their scientific progress a little delayed, than to have their most sacred possession endangered. Of course considerations of this kind will have no weight with representatives of the naturalistic view of the world. Then it can only be emphasized that a science that has no appreciation of the supernatural character of the Catholic Church cannot be in a position to render a fair judgment on many facts in the history of that Church.