This, in many cases by a settled habit,--in things whereof we have frequent experience is performed so constantly and so quick, that we take that for the perception of our sensation which is an idea formed by our judgment; so that one, viz.
that of sensation, serves only to excite the other, and is scarce taken notice of itself;--as a man who reads or hears with attention and understanding, takes little notice of the characters or sounds, but of the ideas that are excited in him by them.
10.

How, by Habit, ideas of Sensation are unconsciously changed into ideas of Judgment.
Nor need we wonder that this is done with so little notice, if we consider how quick the actions of the mind are performed.

For, as itself is thought to take up no space to have no extension; so its actions seem to require no time but many of them seem to be crowded into an instant.
I speak this in comparison to the actions of the body.

Any one may easily observe this in his own thoughts, who will take the pains to reflect on them.

How, as it were in an instant, do our minds, with one glance, see all the parts of a demonstration, which may very well be called a long one, if we consider the time it will require to put it into words, and step by step show it another?
Secondly, we shall not be so much surprised that this is done in us with so little notice, if we consider how the facility which we get of doing things, by a custom of doing, makes them often pass in us without our notice.