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fore to determine that it is only of the size which our sense of sight presents； and we may very distinctly imagine the head of a lion joined to the body of a goat； without being therefore shut up to the conclusion that a chimaera exists； for it is not a dictate of reason that what we thus see or imagine is in reality existent； but it plainly tells us that all our ideas or notions contain in them some truth； for otherwise it could not be that God； who is wholly perfect and veracious； should have placed them in us。 And because our reasonings are never so clear or so complete during sleep as when we are awake； although sometimes the acts of our imagination are then as lively and distinct； if not more so than in our waking moments； reason further dictates that； since all our thoughts cannot be true because of our partial imperfection； those possessing truth must infallibly be found in the experience of our waking moments rather than in that of our dreams。
PART V
I would here willingly have proceeded to exhibit the whole chain of truths which I deduced from these primary but as with a view to this it would have been necessary now to treat of many questions in dispute among the earned； with whom I do not wish to be embroiled； I believe that it will be better for me to refrain from this exposition； and only mention in general what these truths are； that the more judicious may be able to determine whether a more special account of them would conduce to the public advantage。 I have ever remained firm in my original resolution to suppose no other principle than that of which I have recently availed myself in demonstrating the existence of God and of the soul； and to accept as true nothing that did not appear to me more clear and certain than the demonstrations of the geometers had formerly appeared； and yet I venture to state that not only have I found means to satisfy myself in a short time on all the principal difficulties which are usually treated of in philosophy； but I have also observed certain laws established in nature by God in such a manner； and of which he has impressed on our minds such notions； that after we have reflected sufficiently upon these； we cannot doubt that they are accurately observed in all that exists or takes place in the world and farther； by considering the concatenation of these laws； it appears to me that I have discovered many truths more useful and more important than all I had before learned； or even had expected to learn。
But because I have essayed to expound the chief of these discoveries in a treatise which certain considerations prevent me from publishing； I cannot make the results known more conveniently than by here giving a summary of the contents of this treatise。 It was my design to comprise in it all that； before I set myself to write it； I thought I knew of the nature of material objects。 But like the painters who； finding themselves unable to represent equally well on a plain surface all the different faces of a solid body； select one of the chief； on which alone they make the light fall； and throwing the rest into the shade； allow them to appear only in so far as they can be seen while looking at the principal one； so； fearing lest I should not be able to compense in my discourse all that was in my mind； I resolved to expound singly； though at considerable length； my opinions regarding light； then to take the opportunity of adding something on the sun and the fixed stars； since light almost wholly proceeds from them； on the heavens since they transmit it； on the planets； comets； and earth； since they reflect it； and particularly on all the bodies that are upon the earth； since they are either colored； or transparent； or luminous； and finally on man； since he is the spectator of these objects。 Further； to enable me to cast this variety of subjects somewhat into the shade； and to express my judgment regarding them with greater freedom； without being necessitated to adopt or refute the opinions of the learned； I resolved to leave all the people here to their disputes； and to speak only of what would happen in a new world； if God were now to create somewhere in the imaginary spaces matter sufficient to compose one； and were to agitate variously and confusedly the different parts of this matter； so that there resulted a chaos as disordered as the poets ever feigned； and after that did nothing more than lend his ordinary concurrence to nature； and allow her to act in accordance with the laws which he had established。 On this supposition； I； in the first place； described this matter； and essayed to represent it in such a manner that to my mind there can be nothing clearer and more intelligible； except what has been recently said regarding God and the soul； for I even expressly supposed that it possessed none of those forms or qualities which are so debated in the schools； nor in general anything the knowledge of which is not so natural to our minds that no one can so much as imagine himself ignorant of it。 Besides； I have pointed out what are the laws of nature； and； with no other principle upon which to found my reasonings except the infinite perfection of God； I endeavored to demonstrate all those about which there could be any room for doubt； and to prove that they are such； that even if God had created more worlds； there could have been none in which these laws were not observed。 Thereafter； I showed how the greatest part of the matter of this chaos must； in accordance with these laws； dispose and arrange itself in such a way as to present the appearance of heavens； how in the meantime some of its parts must compose an earth and some planets and comets； and others a sun and fixed stars。 And； making a digression at this stage on the subject of light； I expounded at considerable length what the nature of that light must be which is found in the sun and the stars； and how thence in an instant of time it traverses the immense spaces of the heavens； and how from the planets and comets it is reflected towards the earth。 To this I likewise added much respecting the substance； the situation； the motions； and all the different qualities of these heavens and stars； so that I thought I had said enough respecting them to show that there is nothing observable in the heavens or stars of our system that must not； or at least may not appear precisely alike in those of the system which I described。 I came next to speak of the earth in particular； and to show how； even though I had expressly supposed that God had given no weight to the matter of which it is composed； this should not prevent all its parts from tending exactly to its center； how with water and air on its surface； the disposition of the heavens and heavenly bodies； more especially of the moon； must cause a flow and ebb； like in all its circumstances to that observed in our seas； as also a certain current both of water and air from east to west； such as is likewise observed between the tropics； how the mountains； seas； fountains； and rivers might naturally be formed in it； and the metals produced in the mines； and the plants grow in the fields and in general； how all the bodies which are commonly denominated mixed or composite