Usbek to Hassein, dervich of the mountain of Jaron
O thou wise dervich, whose curious mind shines from so much knowledge, listen to what I have to tell thee.
There are philosophers here who in truth have not attained the summit of oriental wisdom ; they have not been raptured to the luminous throne ; they have neither heard the ineffable words with which the concerts of angels resound, nor experienced the powerful surges of a divine fury ; but left to themselves, deprived of holy marvels, they pursue in silence the tracks of human reason.
You could not believe how far this guide has led them. They have sorted out the chaos  and have explained by simple mechanics the order of divine architecture. The author of nature has given movement to matter : it took no more to produce this prodigious variety of effects that we see in the universe. 
Let ordinary legislators propose laws to us to regulate societies of men, laws as subject to change as the minds of those who propose them and the peoples who observe them ; but these speak to us only of laws that are general, immutable, and eternal, which are observed without any exception,  with an order, a regularity and infinite promptitude in the immensity of space.
And what do you believe, divine man, that these laws might be ? Perhaps you imagine that, entering into the counsel of the Eternal, you are going to be astonished by the sublimity of the mysteries : you renouncing understanding in advance, intending only to admire.
But you will soon change your way of thinking. These laws do not dazzle by a false respect ; their simplicity long caused them not to be seen ; it is only after much reflection that all their fertility and breadth has been understood.
The first is that any body tends to describe a straight line  unless it encounters some obstacle that deflects it away ; and the second, which simply derives from the first, is that any body that turns about a center tends to flee it, because the more distant it is, the more the line it describes approaches a straight line.
And that, sublime dervish, is the key to nature. Those are fertile principles, from which consequences can be drawn as far as the eye can see, as I shall make clear to you in a private letter.
The knowledge of five or six truths has made their philosophy full of miracles, and has made them accomplish more wonders and marvels that all we are told of our holy prophets.
For in short I am persuaded that there is not one of our doctors who would not have been baffled if he had been asked to weigh all the air surrounding the earth in a scale,  or to
measure all the water that falls each year on its surface  ; and who would not have thought more than four times before saying how many leagues sound travels in an hour  and the time a ray of light from the sun to reach us.  How many fathoms is it from here to Saturn,  Along what curve must a vessel be shaped to be the best sailing ship possible ? 
Perhaps if some divine man had graced the works of these philosophers with lofty and sublime words, and if he had added bold figures and mysterious allegories to them, he would have made a fine work second only to the holy Qur’an.
Yet if I must to tell you what I think, I do not think much of figurative style. In our Qur’an there are a large number of infantile things  which always so appear to me, although they are enhanced by the force and liveliness of the expression. At first it seems that inspired books are only divine thoughts rendered in human language ; on the contrary, in our holy books, we find the language of God and the thoughts of men, as if by some wondrous whim God had dictated the words, and man had supplied the ideas. 
You will perhaps say that I speak too freely about what is most holy among us ; you will believe that it is the product of the independence they live in here. No, thank heaven, the mind has not corrupted the heart ; and so long as I shall live, Ali shall be my Prophet.
Paris this 15th day of the moon of Chahban 1716