the power of intellect and knowledge, the power of beauty, and the power
of social life and manners--he can hardly deny that this scheme, though
drawn in rough and plain lines enough, and not pretending to scientific
exactness, does yet give a fairly true representation of the matter.
Human nature is built up by these powers; we have the need for them all.
When we have rightly met and adjusted the claims of them all, we shall
then be in a fair way for getting soberness and righteousness, with
wisdom. This is evident enough, and the friends of physical science
would admit it.

But perhaps they may not have sufficiently observed another thing:
namely, that the several powers just mentioned are not isolated, but
there is, in the generality of mankind, a perpetual tendency to relate
them one to another in divers ways. With one such way of relating them I
am particularly concerned now. Following our instinct for intellect and
knowledge, we acquire pieces of knowledge; and presently, in the
generality of men, there arises the desire to relate these pieces of
knowledge to our sense for conduct, to our sense for beauty,--and there
is weariness and dissatisfaction if the desire is balked. Now in this
desire lies, I think, the strength of that hold which letters have upon
us.

All knowledge is, as I said just now, interesting; and even items of
knowledge which from the nature of the case cannot well be related, but
must stand isolated in our thoughts, have their interest. Even lists of
exceptions have their interest. If we are studying Greek accents, it is
interesting to know that _pais_ and _pas_, and some other monosyllables
of the same form of declension, do not take the circumflex upon the last
syllable of the genitive plural, but vary, in this respect, from the
common rule. If we are studying physiology, it is interesting to know