earnestly recommend to the attentive thoughts of the reader.

25. THIRD ARGUMENT.[Note: Vide sect. iii. and vii.]--REFUTATION
OF LOCKE.--All our ideas, sensations, notions, or the things which we
perceive, by whatsoever names they may be distinguished, are visibly
inactive--there is nothing of power or agency included in them. So that
ONE IDEA or object of thought CANNOT PRODUCE or make ANY ALTERATION IN
ANOTHER. To be satisfied of the truth of this, there is nothing else
requisite but a bare observation of our ideas. For, since they and every
part of them exist only in the mind, it follows that there is nothing in
them but what is perceived: but whoever shall attend to his ideas, whether
of sense or reflexion, will not perceive in them any power or activity;
there is, therefore, no such thing contained in them. A little
attention will discover to us that the very being of an idea implies
passiveness and inertness in it, insomuch that it is impossible for an
idea to do anything, or, strictly speaking, to be the cause of anything:
neither can it be the resemblance or pattern of any active being, as is
evident from sect. 8. Whence it plainly follows that extension,
figure, and motion cannot be the cause of our sensations. To say,
therefore, that these are the effects of powers resulting from the
configuration, number, motion, and size of corpuscles, must certainly
be false. [Note: Vide sect. cii.]

26. CAUSE OF IDEAS.--We perceive a continual succession of ideas, some are
anew excited, others are changed or totally disappear. There is therefore
some cause of these ideas, whereon they depend, and which produces and
changes them. That this cause cannot be any quality or idea or combination
of ideas, is clear from the preceding section. I must therefore be a
substance; but it has been shown that there is no corporeal or material
substance: it remains therefore that the CAUSE OF IDEAS is an incorporeal