Front Page Titles (by Subject) CHAPTER I: Of the Excellence and Praise of Reason - The Spiritual Physick
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CHAPTER I: Of the Excellence and Praise of Reason - Rhazes, The Spiritual Physick 
The Spiritual Physic of Rhazes, trans. Arthur J. Arberry (London: John Murray, 1950).
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Of the Excellence and Praise of Reason
The Creator (Exalted be His Name) gave and bestowed upon us Reason to the end that we might thereby attain and achieve every advantage, that lies within the nature of such as us to attain and achieve, in this world and the next. It is God’s greatest blessing to us, and there is nothing that surpasses it in procuring our advantage and profit. By Reason we are preferred above the irrational beasts, so that we rule over them and manage them, subjecting and controlling them in ways profitable alike to us and them. By Reason we reach all that raises us up, and sweetens and beautifies our life, and through it we obtain our purpose and desire. For by Reason we have comprehended the manufacture and use of ships, so that we have reached unto distant lands divided from us by the seas; by it we have achieved medicine with its many uses to the body, and all the other arts that yield us profit. By Reason we have comprehended matters obscure and remote, things that were secret and hidden from us; by it we have learned the shape of the earth and the sky, the dimension of the sun, moon and other stars, their distances and motions; by it we have achieved even the knowledge of the Almighty, our Creator, the most majestic of all that we have sought to reach and our most profitable attainment. In short, Reason is the thing without which our state would be the state of wild beasts, of children and lunatics; it is the thing whereby we picture our intellectual acts before they become manifest to the senses, so that we see them exactly as though we had sensed them, then we represent these pictures in our sensual acts so that they correspond exactly with what we have represented and imagined.
Since this is its worth and place, its value and significance, it behoves us not to bring it down from its high rank or in any way to degrade it, neither to make it the governed seeing that it is the governor, or the controlled seeing that it is the controller, or the subject seeing that it is the sovereign; rather must we consult it in all matters, respecting it and relying upon it always, conducting our affairs as it dictates and bringing them to a stop when it so commands. We must not give Passion the mastery over it, for Passion is the blemish of Reason, clouding it and diverting it from its proper path and right purpose, preventing the reasonable man from finding the true guidance and the ultimate salvation of all his affairs. Nay, but we must discipline and subject our Passion, driving and compelling it to obey the every dictate of Reason. If we do thus, our Reason will become absolutely clear and will illuminate us with all its light, bringing us to the achievement of all that we desire to attain; and we shall be happy in God’s free gift and grace of it.