Read it through once

In treating the subject before me, I shall confine myself to the two ideas which immediately present themselves; the sublime and the beautiful. Of these two I shall endeavour to ascertain their causes, effect, and properties; and to determine what objects produce them, and by what laws the imagination is affected. Though these words are taken from common language, yet the sense in which I use them is not exactly the same as in vulgar speech; and therefore a brief explanation is necessary.