Obscurity, indeed, is painful to
the mind as well as to the eye; but to bring light from obscurity,
by whatever labour, must needs be delightful and rejoicing.
But this obscurity in the profound and abstract philosophy, is
objected to, not only as painful and fatiguing, but as the
inevitable source of uncertainty and error. Here indeed lies the
justest and most plausible objection against a considerable part of
metaphysics, that they are not properly a science; but arise either
from the fruitless efforts of human vanity, which would penetrate into
subjects utterly inaccessible to the understanding, or from the
craft of popular superstitions, which, being unable to defend
themselves on fair ground, raise these intangling brambles to cover
and protect their weakness. Chased from the open country, these
robbers fly into the forest, and lie in wait to break in upon every
unguarded avenue of the mind, and overwhelm it with religious fears
and prejudices.

David Hume: Enquiry Concerning Human Understanding