For as reason is not competent to guide the will with certainty in
regard to its objects and the satisfaction of all our wants (which
it to some extent even multiplies), this being an end to which an
implanted instinct would have led with much greater certainty; and
since, nevertheless, reason is imparted to us as a practical
faculty, i.e., as one which is to have influence on the will,
therefore, admitting that nature generally in the distribution of
her capacities has adapted the means to the end, its true
destination must be to produce a will, not merely good as a means to
something else, but good in itself, for which reason was absolutely
necessary. This will then, though not indeed the sole and complete
good, must be the supreme good and the condition of every other,
even of the desire of happiness. Under these circumstances, there is
nothing inconsistent with the wisdom of nature in the fact that the
cultivation of the reason, which is requisite for the first and
unconditional purpose, does in many ways interfere, at least in this
life, with the attainment of the second, which is always
conditional, namely, happiness. Nay, it may even reduce it to nothing,
without nature thereby failing of her purpose. For reason recognizes
the establishment of a good will as its highest practical destination,
and in attaining this purpose is capable only of a satisfaction of its
own proper kind, namely that from the attainment of an end, which
end again is determined by reason only, notwithstanding that this
may involve many a disappointment to the ends of inclination.

We have then to develop the notion of a will which deserves to be
highly esteemed for itself and is good without a view to anything
further, a notion which exists already in the sound natural
understanding, requiring rather to be cleared up than to be taught,
and which in estimating the value of our actions always takes the