Materialists are those who maintain that the soul of man is material, or that the principle of perception and thought is not a substance distinct from the body, but the result of corporeal organization. There are others called by this name who have maintained that there is nothing but matter in the universe.

The followers of the late Dr. Priestley are considered as Materialists, or philosophical Necessarians. According to the doctor's writings, he believed, --

1. That man is no more than what we now see of him; his being commenced at the time of his conception, or perhaps at an earlier period. The corporeal and mental faculties, inhering in the same substance, grow, ripen, and decay together; and whenever the system is dissolved, it continues in a state of dissolution, till it shall please that Almighty Being who called it into existence, to restore it to life again. For if the mental principle were, in its own nature, immaterial and immortal, all its peculiar faculties would be so too; whereas we see that every faculty of the mind, without exception, is liable to be impaired, and even to become wholly extinct, before death. Since, therefore, all the faculties of the mind, separately taken, appear to be mortal, the substance or principle, in which they exist, must be pronounced mortal too. Thus we might conclude that the body was mortal, from observing that all the separate senses and limbs were liable to decay and perish.

This system gives a real value to the doctrine of the resurrection from the dead, which is peculiar to revelation; on which alone the sacred writers build all our hope of future life; and it explains the uniform language of the Scriptures, which speak of one day of judgment for all mankind, and represent all the rewards of virtue, and all the punishments of vice, as taking place at that awful day, and not before. In the Scriptures, the heathen are represented as without hope, and all mankind as perishing at death, if there be no resurrection of the dead.

The apostle Paul asserts, in 1 Cor.15:16, that "if the dead rise not, then is not Christ risen; and if Christ be not raised, your faith is vain, ye are yet in your sins: then they also who are fallen asleep in Christ are perished." And again, verse 32, "If the dead rise not, let us eat and drink, for to-morrow we die." In the whole discourse, he does not even mention the doctrine of happiness or misery without the body.

If we search the Scriptures for passages expressive of the state of man at death, we shall find such declarations as expressly exclude any trace of sense, thought, or enjoyment. (See Ps.6:5. Job 14:7, &c.)

2. That there is some fixed law of nature respecting the will, as well as the other powers of the mind, and every thing else in the constitution of nature; and consequently that it is never determined without some real or apparent cause foreign to itself, i. e., without some motive of choice; or that motives influence us in some definite and invariable manner, so that every volition, or choice, is constantly regulated and determined by what precedes it; and this constant determination of mind, according to the motives presented to it, is what is meant by its necessary determination. This being admitted to be fact, there will be a necessary connection between all things past, present, and to come, in the way of proper cause and effect, as much in the intellectual as in the natural world; so that, according to the established laws of nature, no event could have been otherwise than it has been, or is to be, and therefore all things past, present, and to come, are precisely what the Author of Nature really intended them to be, and has made provision for.

To establish this conclusion, nothing is necessary but that throughout all nature the same consequences should invariably result from the same circumstances. For if this be admitted, it will necessarily follow that, at the commencement of any system, since the several parts of it, and their respective situations, were appointed by the Deity, the first change would take place according to a certain rule established by himself, the result of which would be a new situation; after which the same laws containing another change would succeed, according to the same rules, and so on forever; every new situation invariably leading to another, and every event, from the commencement to the termination of the system, being strictly connected, so that, unless the fundamental laws of the system were changed, it would be impossible that any event should have been otherwise than it was. In all these cases, the circumstances preceding any change are called the causes of that change; and, since a determinate event, or effect, constantly follows certain circumstances, or causes, the connection between cause and effect is concluded to be invariable, and therefore necessary.

It is universally acknowledged that there can be no effect without an adequate cause. This is even the foundation on which the only proper argument for the being of a God rests. And the Necessarian asserts that if, in any given state of mind, with respect both to dispositions and motives, two different determinations, or volitions, be possible, it can be on no other principle, than that one of them should come under the description of an effect without a cause; just as if the beam of a balance might incline either way, though loaded with equal weights. And if any thing whatever -- even a thought in the mind of man -- could arise without an adequate cause, any thing else -- the mind itself, or the whole universe -- might likewise exist without an adequate cause.

This scheme of philosophical necessity implies a chain of causes and effects established by infinite wisdom, and terminating in the greatest good of the whole universe; evils of all kinds, natural and moral, being admitted, as far as they contribute to that end, or are in the nature of things inseparable from it. Vice is productive, not of good, but of evil, to us, both here and hereafter, though good may result from it to the whole system; and, according to the fixed laws of nature, our present and future happiness necessarily depends on our cultivating good dispositions.