Ralph Cudworth on Theism, Atheism and the Cause of All Other ThingsThe True Intellectual System of the Universe (Gould & Newman: 1837; orig. 1678), pp. 266-7.
Wherefore, we shall in the next place declare, what this idea of God is, or what is that thing, whose existence they that affirm, are called Theists, and they who deny, Atheists. In order whereunto, we must first lay down this lemma, or preparatory proposition — that as it is generally acknowledged, that all things did not exist from eternity, such as they are, unmade, but that some things were made and generated or produced; so it is not possible that all things should be made neither, but there must of necessity be something self-existent from eternity, and unmade; because if there had been once nothing, there could never have been any thing. The reason of which is so evident and irresistible, that even the Atheists confess themselves conquered by it, and readily acknowledge it for an indubitable truth, that there must be something αγεννηιον, something which was never made or produced — and which therefore is the cause of those other things that are made, something … that was self-originated and self-existing … Wherefore all the question now is, what is this … which is the cause of all other things that are made. ¶ Now there are two grand opinions opposite to one another concerning it; for, first, some contend, that the only self-existent, unmade and incorruptible thing, and first principle of all things, is senseless matter; that is, matter either perfectly dead and stupid, or at least devoid of all animalish and conscious life. But because this is really the lowest and most imperfect of all beings, others on the contrary judge it reasonable … that the only unmade thing, which was the principle, cause, and original of all other things, was not senseless matter, but a perfect conscious understanding nature, or mind. And these are they, who are strictly and properly called Theists, who affirm, that a perfectly conscious understanding being, or mind, existing of itself from eternity, was the cause of all other things; and they, on the contrary, who derive all things from senseless matter, as the first original, and deny that there is any conscious understanding being self-existent or unmade, are those that are properly called Atheists.