While therefore fully appreciating the reverent wish of Christian men to defend the truth with sacred tenacity, which leads them to regard all doubt with alarm; we can frankly allow the function and use of the phenomenon of doubt in history, when viewed as an intellectual fact. The use of it is to test all beliefs, with the view of bringing out their truth and error. But the good result has often, we perceive, been undesigned. It has frequently too been dearly bought, attained at an incalculable spiritual loss to the souls of those who have doubted. The result accordingly leaves untouched the responsibility of the doubter, and only shows the use which an allwise Providence makes free thought subserve in the general progress of the world.

But the heart asks a further moral. Though it derives satisfaction from perceiving that even features of history which seem the darkest, and moments the most perilous, bear witness to the presence of a benevolent Creator, who overrules all for the improvement of man and the progress of the church; it still claims to know what those limits are, where doubt must expire in awe, and speculation in adoration. It longs to exercise inquiry, and yet retain the Christian faith. It asks earnestly what does the history teach us concerning the doubts that are most likely to meet us in our lifetime, and what lessons are supplied by it in reference to the best mode at once of maintaining our own faith, and of leading those who doubt to the faith which we receive. The materials are supplied for an answer to these questions; probably even the materials for the final answer which the church can give to them.

We venture not to utter predictions in reference to the future; but the thought is interesting and solemn, that there seems some reason to believe that the weapons which doubt on the one hand, and religion on the other, must use in the final adjudication of their claims, at least in reference to all fundamental questions, are already in men's hands. Though our express denial [pg 354] that doubt perpetually recurs in cycles might cause it to be supposed that we should be inclined to anticipate the existence of future crises of faith; yet we have remarked that such crises are always produced by the opening of some unexplored field of knowledge, the introduction of a collection of new ideas or of a new spirit excited by new ideas, on subjects traversed either by the Christian religion, or by the Christian inspired books. A survey of the present state of knowledge would probably lead us to think that no field lies unexamined from which such new material can hereafter come. The physical sciences which, by the discovery of an order of nature and general laws of causation, have heretofore suggested difficulties in reference to miraculous interposition, and, by means of the discoveries in astronomy and geology, have come into conflict with the ancient Hebrew cosmogony, are not likely to suggest fresh ones distinct in kind from the past. If there be not ground for discouragement in science, nor for doubting that the present state of it, which seems to offer employment for originality of mind rather in tracking old principles into details than in ascending to new ones,[1022] is merely a temporary one, destined to pass away when some happy guess shall reveal the highest laws which now baffle inquiry; yet it is not probable that such an advance will traverse the province of religion. The survey of those regions where discovery seems most hopeful, will explain the reason of this assumption.

If the present examination of some of the subtler forms of matter or of force,[1023] and of their existence in other globes of the solar system than our own, should hereafter lead to a generalization which shall extend [pg 355] natural philosophy as widely beyond its present limits as the discovery made by Newton beyond those of his predecessors, yet these discoveries can have no bearing, favourable or unfavourable to religion, distinct in kind from that of present ones. If even a still mightier stride should be taken, and physiology be able to lay bare the subtle processes through which mind acts on body;[1024] yet the difficulty would only be an enhanced form of that which is already used to discredit the spirituality and immortality of the soul.

If we pass from the physical to the moral or metaphysical sciences, there is still less ground for expecting progress. True so far as they go, they offer no opportunity for enlargement, unless perhaps a more careful analysis, by means of the fertile principle of mental association,[1025] should cast light on the sensational source of ideas and the physiological side of mind; and even this would leave the independent evidence of the mental data, moral and intellectual, of religion, on the same basis as at present. Critical science again has attained such perfection, that there is no possibility of an entirely new range of critical thought springing up in reference to religion, such as arose when the German mind was creating the science of historical criticism.

Thus, though each branch of science,—physical, metaphysical, and critical,—offers grounds of hope to the labourer, there is no reason to fear that sceptical difficulties will be generated by any of them, distinct in [pg 356] kind from those which now exist. And a similar line of argument will suggest, that there is little reason to hope, on the other hand, for enlargement of the grounds of the evidence of natural and revealed religion. If this be the case, the materials are accordingly supplied, from which thoughtful students must make up their minds finally on the questions at issue. Indeed the survey of modern thought which we have already made, will have shown that men are already taking their place in hostile array; and will have revealed differences so fundamental in reference to religion, on subjects where no further evidence can be offered, that there can be little reason to hope for the alteration of the state of parties to the end of time. Never was there an age wherein Christianity had so real, so potent an effect as the present; yet never was there one which, while so largely moulded by it, was so really hostile to it.[1026] It is the hostility, not of opposition which regards Christianity as false, but of the criticism which views it as obsolete, and considers it to be one phase of the world's religious thought, the eternal truths of which may be assimilated without the historic and dogmatic basis under which its originators conceived it. Though the special forms of doubt that now exist derive their lineage, philosophical and historical, from the modern German and French sources, which we have studied in the last two lectures; yet it is in an older age of European history that the nearest general parallel to the present state of feeling may perhaps be found; and there is a deep truth in the analogy which the learned and excellent critic,[1027] who has recently made a special study of the struggle of classical heathenism against Christianity, has pointed out, between the feeling of philosophers in the second and third centuries of the Christian era and in the present time.

Amid very wide differences in tone and learning, there is this fundamental agreement between the age which was enriched with the accumulated learning of the old civilization, and the present, enriched with that of the new. There is the same spirit of naturalism; the same indisposition to rise to the belief of the interference of Deity; the same feeling of contempt for positive religions; the same sensation of heart-weariness,—the utterance as it were of the desponding feeling, “Who will show us any good?” the same lofty theory of stoic morality, and disposition to find perfection in obedience to nature's laws, physical and moral; the same approximation to the Christian ideal of perfection, while destroying the very proof of the means by which it is to be acquired. And if it be true that the state of intellectual men presents so marked a parallel, so in like manner the study of the arguments by which the early fathers in their apologetic treatises met the doubts of such minds, becomes a question of great practical as well as literary interest.[1028]

What then are the doubts which are most likely to meet us, either insinuating themselves into our own minds, or offering their difficulty to those who intend to become ministers of Christ? and what are the means by which they may be most effectually repelled?

The main difficulties may be summed up as three:—

(1) The question of the relation of religion, and more particularly of Christianity, to the human soul; whether religion is anything but morality, and Christianity its highest type.