A master who had been cruel to his slaves might become a slave in his turn, and undergo the torments he had inflicted on others. He who has wielded a… - Allan Kardec

When a spirit has reached the end of the term assigned by Providence to his errant life, he chooses for himself the trials which he determines to undergo in order to hasten his progress - that is to say, the kind of existence which he believes will be most likely to furnish him with the means of advancing and the trials of this new existence always correspond to the faults which he has to expiate. If he triumphs in this new struggle, he rises in grade; if he succumbs, he has to try again.

Intellectual superiority is not always accompanied by an equal degree of moral superiority, and the greatest geniuses may have much to expiate. For this reason, they often have to undergo an existence inferior to the one they have previously accomplished, which is a cause of suffering for them the hindrances to the manifestation of his faculties thus imposed upon a spirit being like chains that fetter the movements of a vigorous man. The idiot may be said to be lame in the brain, as the halt is lame in the legs, and the blind, in the eyes.

If demons existed, they would be the work of God; but would it he just on the part of God to have created beings condemned eternally to evil and to misery? If demons exist, it is in your low world, and in other worlds of similar degree that they are to be found. They are the human hypocrites who represent a just God as being cruel and vindictive, and who imagine that they make themselves agreeable to Him by the abominations they commit in His name.