In certain cases its action is expressed visibly and rapidly; for instance, a venomous thought may[30] cause the death of the person against whom it is directed--this is one aspect of the "evil eye"--as also it may[31] return to its starting-point and kill the one who generated it, by the recoil. Every mental projection of a criminal nature, however, by no means necessarily reaches the object aimed at; a sorcerer, for instance, could no more injure one who was positive, consciously and willingly good, than he could cause a grain of corn to sprout on a block of granite; favourable soil is needed to enable the seed of evil to take root in a man's heart; otherwise, the evil recoils with its full force upon the one who sent it forth and who is an irresistible magnet, for he is its very "life-centre." Thoughts cling to their creator and attract towards this latter those of a similar nature floating about in the invisible world, for they instinctively come to vitalise and invigorate themselves by contact with him; they radiate around him a contagious atmosphere of good or evil, and when they have left him, hover about, at the caprice of the various currents, impelling those they touch towards the goal to which they are making. They even recoil on the visible form of their generator; it is for this reason that physical is closely connected with moral well-being, and most of our diseases are nothing else than the outer expression of the hidden leaven of passion. When the action of this latter is sudden and powerful, diseases may be the immediate consequence thereof; blinded by materialism, certain doctors seldom acknowledge their real cause; and yet instances of hair turning white in a single night are too numerous to be refuted, congestion of the brain brought on by a fit of anger, jaundice and other grave maladies caused by grief and trouble, are to be met with continually. When the mental forces which disturb the physical organs meet with obstacles which prevent their immediate outlet, they accumulate, like the electric fluid in a condenser, until an unexpected contact produces a discharge; this condensation often persists for a whole life in a latent condition, and is preserved intact for a future incarnation; this is the cause of original vices, which, incorporated in the etheric double, react upon the organic texture of the body. This also explains why each individual possesses an _ensemble_ of pathological predispositions often radically different from those heredity should have bequeathed to him; it is also, to some extent, the key to physiognomy, for every single feature bears either the stamp of our passions or the halo of our virtues.