6. If we admit the solicitude of God for his creatures, why should we not also admit that the spirits are capable, by their energy and superior knowledge, to assist humanity to advance; that they are reincarnated at the desire of God, with the view of aiding progress in a definite manner; that they receive a mission as an ambassador receives one from his sovereign? Such is the role of the great geniuses. What come they to do, if not to teach to men truths of which they are ignorant, and of which they would not acquire the knowledge during still longer periods of time, had they not come to give the stepping-stone by which men are enabled to elevate themselves more rapidly? These geniuses who appear at different epochs like brilliant stars, leaving after them a long, luminous track for humanity, are missionaries, - or, better, Messiahs. The new facts they bring to light, be they of a physical or philosophical order, are revelations.
If God ordains revealers of scientific truths, he can, for a stronger reason, create them for moral truths, which are an essential element of progress, such as the philosophers whose ideas have lived through the ages.