His theological writings[469] are in the form of letters, [pg 145] or of essays, the common form of didactic writings in that age. We shall briefly state his views on deity, futurity, and revelation.

He teaches the existence of a deity, but was led, by the sensational philosophy which he adopted from Locke, to deny the possibility of an à priori proof of the divine existence,[470] and contends strongly that the divine attributes can only be known by observation of nature, and not by the analogy of man's constitution. He considers too that the deity whose existence he has thus allowed, exercises a general but not a special providence;[471] the world being a machine moving by delegated powers without the divine interference. The philosophy expressed in Pope's didactic poetry gives expression to Bolingbroke's opinions[472] on providence.

In his views of human duty Bolingbroke refers conduct to self-love as a cause, and to happiness as an end; and doubts a future state,[473] either on the ground of materialism, or possibly because his favourite principle, that “whatever is, is best,” led him to disbelieve the argument for a future life adduced from the inequality of present rewards. Future punishment is rejected, on the ground that it can offer no end compatible with the moral object of punishment, which is correction.

When he passes from natural religion to revealed, he allows the possibility of divine inspiration, but [pg 146] doubts the fact; rebuking those however who doubt things merely because they cannot understand them. In criticising the Jewish revelation,[474] he puts no limits to his words of severity. He dares to pronounce the Jewish history to be repugnant to the attributes of a supreme, all-perfect Being. His attack on the records is partly on account of the materials contained in them, such as the narrative of the fall, the numerical statistics, the invasion of the Canaanites, the absence of eternal rewards as sanctions of the Mosaic law; and partly on the ground of the evidence being, as he alleges, not narrated by contemporaries. In giving his opinion of Christianity, he repeats the weak objection already used by Chubb, of a distinction existing between the gospel of Christ and of Paul;[475] and tries to explain the origin of Christianity and of its doctrines, suggesting the derivation of the idea of a Trinity from the triadic notions of other religions. But he is driven to concede some things denied by former deists. He grants, for example, that if the miracles really occurred, they attest the revelation;[476] and he therefore labours to show that they did not occur, by attacking the New Testament canon[477] as he had before attacked the Old; attempting to show that the composition of the gospels was separated by an interval from the alleged occurrence of the events; applying, in fact, Pouilly's incipient criticism on history which has been so freely used in theology by more recent critics.

These remarks will exhibit Bolingbroke's views, both in their cause and their relation to those of former deists. It will be observed that they are for the most part a direct result either of sensational metaphysics or of the incipient science of historical criticism.

The inquiry was now becoming more historical on the part both of deists and Christians. Philosophy was still the cause of religious controversy, but it had changed in character. It was now criticism weighing the evidence of religion rather than ethics or metaphysics [pg 147] testing the materials of it. The question formerly debated had been, how much of the internal characteristics of scripture can be supported by moral philosophy; and when the conviction at length grew up, that the mysteries could not be solved by any analogy, but were unique, it became necessary to rest on the miraculous evidence for the existence of a revelation, and make the fact guarantee the contents of it. Inasmuch however as the revelation is contained in a book, it became necessary to substantiate the historical evidence of its genuineness and authenticity. Bolingbroke's attacks are directed against a portion of this literary evidence.

Historical criticism, in its appreciation of literary evidence, may be of four kinds. It may (1) examine the record from a dogmatic point of view, pronouncing on it by reference to prepossessions directed against the facts; or (2) make use of the same method, but direct the attack against the evidence on which the record rests; or (3) it may examine whether the record is contemporary with the events narrated; or (4) consider its internal agreement with itself or with fact.

We have instances of each of these methods in the examination of the literary evidence on which miracles are believed. The first, the prepossession concerning the philosophical impossibility of miracles, is seen in Spinoza; the second, the impossibility of using testimony as a proof of them, in Hume; the third, the question whether they were attested by eyewitnesses, is the ground which Bolingbroke touches; the fourth, the cross-examination of the witnesses, is seen in Woolston. Of these, the first most nearly resembles the great mass of the deist objections to revelation, being philosophical rather than critical. The second forms a transition to the two latter, being philosophy applied to criticism, and is the form which deism now took. The two latter are those which it subsequently assumed.[478]

These remarks will explain Hume's position,[479] and show how he forms the transition between two modes of inquiry; his point of view being critical, the cause of it philosophical. His speculations in reference to religion are chiefly contained in his Essays on the Human Understanding. A brief explanation is necessary to show the dependence of his theology on his philosophy.

The speculations of Locke, as we have before had occasion to notice, gave an impulse to psychological investigations. He clearly saw that knowledge is limited by the faculties which are its source, which he considered to be reducible to sensation and reflection; but while denying the existence of innate ideas, he admitted the existence of innate faculties. Hartley carried the analysis still farther, by introducing the potent instrument offered by the doctrine of the association of ideas. Hume, adopting this principle, applied it, in a manner very like the independent contemporaneous speculations of Condillac in France, to analyse the faculties themselves into sensations, and to furnish a more complete account of the nature of some of our most general ideas, such, for example, as the notion of cause. The intellectual element implied in Locke's account of the process of reflection here drops out. Faculties are regarded as transformed sensations; the nature of knowledge as coextensive with sensation. According to such a theory therefore, the idea of physical cause can mean nothing more than the invariable connexion of antecedent and consequent. The notion of force or power which we attach to causation becomes an unreality; being an idea not given in sensation, which can merely detect sequence.