1941. This may be illustrated by things pertaining to the human body; when, for instance, any offending substance touches the fibrils, or the sensitive parts in the organs, or the insensible in the viscera, the fibers instantly constringe, and put on such a form and quality that they cannot be injured, although assailed by that which is painful, foul, and disagreeable. The effect is similar in the case of evil spirits attempting to injure the good.