The meanest and most obvious things that come in our way have dark sides, that the quickest sight cannot penetrate into.

The clearest and most enlarged understandings of thinking men find themselves puzzled and at a loss in every particle of matter.

We shall the less wonder to find it so, when we consider the CAUSES OF OUR IGNORANCE; which, from what has been said, I suppose will be found to be these three:-- First, Want of ideas.

Its causes.
Secondly, Want of a discoverable connexion between the ideas we have.
Thirdly, Want of tracing and examining our ideas.
23.

First, One Cause of our ignorance Want of Ideas.
I.Want of simple ideas that other creatures in other parts of the universe may have.
FIRST, There are some things, and those not a few, that we are ignorant of, for want of ideas.
First, all the simple ideas we have are confined (as I have shown) to those we receive from corporeal objects by sensation, and from the operations of our own minds as the objects of reflection.