The argumentative method of Theology is that of a strict science, such as Geometry, or deductive; the method of Physics, at least on starting, is that of an empirical pursuit, or inductive. This peculiarity on either side arises from the nature of the case. In Physics a vast and omnigenous mass of information lies before the inquirer, all in a confused litter, and needing arrangement and analysis. In Theology such varied phenomena are wanting, and Revelation presents itself instead. What is known in Christianity is just that which is revealed, and nothing more; certain truths, communicated directly from above, are committed to the keeping of the faithful, and to the very last nothing can really be added to those truths. From the time of the Apostles to the end of the world no strictly new truth can be added to the theological information which the Apostles were inspired to deliver. It is possible of course to make numberless deductions from the original doctrines; but, as the conclusion is ever in its premisses, such deductions are not, strictly speaking, an addition; and, though experience may variously guide and modify those deductions, still, on the whole, Theology retains the severe character of a science, advancing syllogistically from premisses to conclusion.
The method of Physics is just the reverse of this: it has hardly any principles or truths to start with, externally delivered and already ascertained. It has to commence [pg 442] *mence with sight and touch; it has to handle, weigh, and measure its own exuberant sylva of phenomena, and from these to advance to new truths,—truths, that is, which are beyond and distinct from the phenomena from which they originate. Thus Physical Science is experimental, Theology traditional; Physical Science is the richer, Theology the more exact; Physics the bolder, Theology the surer; Physics progressive, Theology, in comparison, stationary; Theology is loyal to the past, Physics has visions of the future. Such they are, I repeat, and such their respective methods of inquiry, from the nature of the case.
But minds habituated to either of these two methods can hardly help extending it beyond its due limits, unless they are put upon their guard, and have great command of themselves. It cannot be denied that divines have from time to time been much inclined to give a traditional, logical shape to sciences which do not admit of any such treatment. Nor can it be denied, on the other hand, that men of science often show a special irritation at theologians for going by antiquity, precedent, authority, and logic, and for declining to introduce Bacon or Niebuhr into their own school, or to apply some new experimental and critical process for the improvement of that which has been given once for all from above. Hence the mutual jealousy of the two parties; and I shall now attempt to give instances of it.
7.
First, then, let me refer to those interpretations of Scripture, popular and of long standing, though not authoritative, to which I have already had occasion to allude. Scripture, we know, is to be interpreted according to the unanimous consent of the Fathers; but, [pg 443] besides this consent, which is of authority, carrying with it the evidence of its truth, there have ever been in Christendom a number of floating opinions, more or less appended to the divine tradition; opinions which have a certain probability of being more than human, or of having a basis or admixture of truth, but which admit of no test, whence they came, or how far they are true, besides the course of events, and which meanwhile are to be received at least with attention and deference. Sometimes they are comments on Scripture prophecy, sometimes on other obscurities or mysteries. It was once an opinion, for instance, drawn from the sacred text, that the Christian Dispensation was to last a thousand years, and no more; the event disproved it. A still more exact and plausible tradition, derived from Scripture, was that which asserted that, when the Roman Empire should fall to pieces, Antichrist should appear, who should be followed at once by the Second Coming. Various Fathers thus interpret St. Paul, and Bellarmine receives the interpretation as late as the sixteenth century. The event alone can decide if, under any aspect of Christian history, it is true; but at present we are at least able to say that it is not true in that broad plain sense in which it was once received.
Passing from comments on prophetical passages of Scripture to those on cosmological, it was, I suppose, the common belief of ages, sustained by received interpretations of the sacred text, that the earth was immovable. Hence, I suppose, it was that the Irish Bishop who asserted the existence of the Antipodes alarmed his contemporaries; though it is well to observe that, even in the dark age in which he lived, the Holy See, to which reference was made, did not commit itself to any condemnation of the unusual opinion. The same alarm again [pg 444] occupied the public mind when the Copernican System was first advocated: nor were the received traditions, which were the ground of that alarm, hastily to be rejected; yet rejected they ultimately have been. If in any quarter these human traditions were enforced, and, as it were, enacted, to the prejudice and detriment of scientific investigations (and this was never done by the Church herself), this was a case of undue interference on the part of the Theological schools in the province of Physics.
So much may be said as regards interpretations of Scripture; but it is easy to see that other received opinions, not resting on the sacred volume, might with less claim and greater inconvenience be put forward to harass the physical inquirer, to challenge his submission, and to preclude that process of examination which is proper to his own peculiar pursuit. Such are the dictatorial formulæ against which Bacon inveighs, and the effect of which was to change Physics into a deductive science, and to oblige the student to assume implicitly, as first principles, enunciations and maxims, which were venerable, only because no one could tell whence they came, and authoritative, only because no one could say what arguments there were in their favour. In proportion as these encroachments were made upon his own field of inquiry would be the indignation of the physical philosopher; and he would exercise a scepticism which relieved his feelings, while it approved itself to his reason, if he was called on ever to keep in mind that light bodies went up, and heavy bodies fell down, and other similar maxims, which had no pretensions to a divine origin, or to be considered self-evident principles, or intuitive truths.
And in like manner, if a philosopher with a true genius for physical research found the Physical Schools of his [pg 445] day occupied with the discussion of final causes, and solving difficulties in material nature by means of them; if he found it decided, for instance, that the roots of trees make for the river, because they need moisture, or that the axis of the earth lies at a certain angle to the plane of its motion by reason of certain advantages thence accruing to its inhabitants, I should not wonder at his exerting himself for a great reform in the process of inquiry, preaching the method of Induction, and, if he fancied that theologians were indirectly or in any respect the occasion of the blunder, getting provoked for a time, however unreasonably, with Theology itself.
I wish the experimental school of Philosophers had gone no further in its opposition to Theology than indulging in some indignation at it for the fault of its disciples; but it must be confessed that it has run into excesses on its own side for which the school of high Deductive Science has afforded no precedent; and that, if it once for a time suffered from the tyranny of the logical method of inquiry, it has encouraged, by way of reprisals, encroachments and usurpations on the province of Theology far more serious than that unintentional and long obsolete interference with its own province, on the part of Theologians, which has been its excuse. And to these unjustifiable and mischievous intrusions made by the Experimentalists into the department of Theology I have now, Gentlemen, to call your attention.