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CHAPTER XVI.[1]
ON THE PRACTICAL USE OF REASON AND ON STOICISM.
In the seventh chapter I have shown that, in the theoretical sphere, procedure based upon conceptions suffices for mediocre achievements only, while great achievements, on the other hand, demand that we should draw from perception itself as the primary source of all knowledge. In the practical sphere, however, the converse is the case. Here determination by what is perceived is the way of the brutes, but is unworthy of man, who has conceptions to guide his conduct, and is thus emancipated from the power of what is actually perceptibly present, to which the brute is unconditionally given over. In proportion as a man makes good this prerogative his conduct may be called rational, and only in this sense can we speak of practical reason, not in the Kantian sense, the inadmissibility of which I have thoroughly exposed in my prize essay on the foundation of morals.
It is not easy, however, to let oneself be determined by conceptions alone; for the directly present external world, with its perceptible reality, intrudes itself forcibly even on the strongest mind. But it is just in conquering this impression, in destroying its illusion, that the human spirit shows its worth and greatness. Thus if incitements to lust and pleasure leave it unaffected, if the threats and fury of enraged enemies do not shake it, if the entreaties of erring friends do not make its
1 This chapter is connected with § 16 of the first volume.
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