You would not have thought of imagining such a case yourself, I am
aware; for it never comes into a child's head to think that things can
be otherwise than as God has made them. And in that respect children
are sometimes wiser than philosophers. Nevertheless, we will suppose
this for once, and consider what would happen in consequence.

Well, in the first place, you would eat old mouldy cake with just the
same relish as if it were fresh; and this mouldy cake, which now you
carefully avoid because it is mouldy, is very unwholesome food, and
would poison you were you to eat a great deal of it.

I give this merely as an instance, but it is one of a thousand. And
although, with regard to eatables, you only know such as have been
prepared either in shops or in your mamma's kitchen, still you must
be aware there are many we ought to avoid, because they would do no
good in our stomachs, and that we should often be puzzled to distinguish
these from others, if the sense of taste did not warn us about them.
You must admit, therefore, that such warnings are not without their
value.

In short, it is a marvellous fact that what is unfit for food, is
_almost always_ to be recognized as it enters the mouth, by its
disagreeable taste; a further proof that God has thought of everything.
Medicines, it is true, are unpleasant to the taste, and yet have to
be swallowed in certain cases. But we may compare them to
chimney-sweepers, who are neither pretty to look at, nor invited into
the drawing-room; but who, nevertheless, are from time to time let
into the grandest houses by the porters--though possibly with a
grimace--because their services are wanted. And in the same way