50. The providential aim of spirit manifestations is to convince disbelievers that all does not end for human beings when their life on earth ends, and to give believers a more correct idea regarding the future. Good, spirits come to instruct us for our improvement and progress, but not to reveal to us what we must not yet know or what we must learn solely by our own efforts. If it were enough to simply ask spirits in order to get the solution to every scientific problem, or to make discoveries or profitable inventions, any ignoramus could become a genius at no cost, and any lazy person could get rich without having to work for it - which is not what God has willed. Spirits help persons of genius through inspiration, but in. order to leave the merit to them they do not exempt them from having to do work or research.