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The material contained in that book and others of the same kind is that from which benefit can be
expected. Chapters not confined to the same subject are of two kinds.

The first comprises chapters which deal with subjects other than the foundations of the articles of
faith,
such as those which discuss propensity, transmutations and the different kinds of perceptions or
discoursing on sight, whether or not it has an opposite which is called obstruction or blindness.
If this
obstruction does exist, then it will be an obstruction (which prevents the eye) from (seeing) all
invisible
things, or a proof which verifies every visible thing that can be seen, as well as other
misleading
trivialities.

The second kind of these chapters contains a further expansion of the same arguments as applied to
other subjects, together with several questions and answers - details which add nothing but
confusion
and perplexity to him who has not already been convinced by the previous material. For there are
certain things which become more obscure with dilation and expansion.