The Twilight of the Idols · Friedrich Wilhelm Nietzsche
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And what delicate instruments of observation we have in our senses! This human nose, for instance, of which no philosopher has yet spoken with reverence and gratitude, is, for the present, the most finely adjusted instrument at our disposal: it is able to register even such slight changes of movement as the spectroscope would be unable to record. Our scientific triumphs at the present day extend precisely so far as we have accepted the evidence of our senses,—as we have sharpened and armed them, and learned to follow them up to the end. What remains is abortive and not yet science—that is to say, metaphysics, theology, psychology, epistemology, or formal science, or a doctrine of symbols, like logic and its applied form mathematics. In all these things reality does not come into consideration at all, even as a problem; just as little as does the question concerning the general value of such a convention of symbols as logic.
Text from Project Gutenberg, public domain in the United States.