viii., that the present existence of our mind depends solely on the fact, that the mind involves the actual existence of the body.
Lastly, we showed (II.xvii., xviii.

and note) that the power of the mind, whereby it imagines and remembers things, also depends on the fact, that it involves the actual existence of the body.
Whence it follows, that the present existence of the mind and its power of imagining are removed, as soon as the mind ceases to affirm the present existence of the body.

Now the cause, why the mind ceases to affirm this existence of the body, cannot be the mind itself (III.

iv.), nor again the fact that the body ceases to exist.

For (by II.