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Click on the phrases to see them in context. The original texts by Immanuel Kant and David Hume are available from the Gutenberg Projet.

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It is a humiliating consideration for human reason that it is incompetent to discover truth by means of pure speculation, but, on the contrary, stands in need of discipline to check its deviations from the straight path and to expose the illusions which it originates.

 Now for what reason should the same passion of pity produce love to the person, who suffers the misfortune, and hatred to the person, who causes it; unless it be because in the latter case the author bears a relation only to the misfortune; whereas in considering the sufferer we carry our view on every side, and wish for his prosperity, as well as are sensible of his affliction? The metaphysic of speculative reason is what is commonly called metaphysic in the more limited sense. The former encourages and advances science--although to the prejudice of the practical; the latter presents us with excellent principles for the investigation of the practical, but, in relation to everything regarding which we can attain to speculative cognition, permits reason to append idealistic explanations of natural phenomena, to the great injury of physical investigation. 

This is the great utility of the sceptical mode of treating the questions addressed by pure reason to itself.

 
In a system of pure reason, definitions of them would be with justice demanded of me, but to give them here would only bide from our view the main aim of our investigation, at the same time raising doubts and objections, the consideration of which, without injustice to our main purpose, may be very well postponed till another opportunity.
 I shall add as a fourth corrollary that we can never have reason to believe that any object exists, of which we cannot form an idea. Deceived by such a proof of the power of reason, we can perceive no limits to the extension of our knowledge. A will, which can be determined independently of sensuous impulses, consequently by motives presented by reason alone, is called a free will (arbitrium liberum); and everything which is connected with this free will, either as principle or consequence, is termed practical.