Originally Written by Immanuel Kant
However, one can ask himself: what treasure is this that we intend to deliver to posterity in this metaphysics depurated by critique and, exactly because of that, placed in a lasting state? A quick glance in this work may lead to believe that its utility is negative, meaning, that of never daring to go beyond, with speculative reason, the limits of experience, this one being, positively, its first utility. Nevertheless, this utility soon becomes positive if we wake to the fact that the principles in which the speculative reason bases itself, with the intent to risk itself to beyond its limits, have as inevitable consequence not the extension, but, looking closely, a restriction to our usage of reason, as, in fact, these principles threats to extend to everything the limits of the sensiticity to which they belong, and hence reduce to nothing the pure practical usage of reason. So, despite a critique that limits the use of speculative reason being a negative, as it nulls a obstacle that limits or even threats of annihilation the practical use of reason, its truly a positive utility and highly important, as soon as we find out that there is a practical use that is absolutely necessary for the pure reason (
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