6. Whether any ideas are due to causes really privative.
And thus one may truly be said to see darkness. For,
supposing a hole perfectly dark, from whence no light is reflected, it is certain one may see the figure of it, or it
may be painted; or whether the ink I write with makes any other idea, is a question. The privative causes I have
here assigned of positive ideas are according to the common opinion; but, in truth, it will be hard to determine
whether there be really any ideas from a privative cause, till it be determined, whether rest be any more a
privation than motion.