4649. Hence it is, since such spirits apply themselves there and aggravate the disease by their presence, that, if they should be removed by the Lord, man would at once be restored; for there are evil and false spirits to whom correspond diseases and ailments of every kind. But such a one as is in the other life, as to his spirit, is exempt, so long as the Lord grants that he lives in the world. And, since he speaks with spirits, and is sensible of their presence, it is also given him to know such things.