4. Immensity.
Each different distance is a different modification of space; and each idea of any different distance,
or space, is a simple mode of this idea. Men, for the use and by the custom of measuring, settle in their minds the
ideas of certain stated lengths,--such as are an inch, foot, yard, fathom, mile, diameter of the earth, etc., which are
so many distinct ideas made up only of space. When any such stated lengths or measures of space are made
familiar to men's thoughts, they can, in their minds, repeat them as often as they will, without mixing or joining to
them the idea of body, or anything else; and frame to themselves the ideas of long, square, or cubic feet, yards or
fathoms, here amongst the bodies of the universe, or else beyond the utmost bounds of all bodies; and, by adding
these still one to another, enlarge their ideas of space as much as they please. The power of repeating or doubling
any idea we have of any distance and adding it to the former as often as we will, without being ever able to come
to any stop or stint, let us enlarge it as much as we will, is that which gives us the idea of immensity.
