"Besides, these natural inequalities are also advantageous for individual progress in another way; the errors resulting therefrom cause truths to be discovered; vices laid bare almost form a reason for the practice of virtue by all men, or at all events they protect one from vice by reason of the horror they inspire; the ignorance of some arouses the love of science in others; the very idleness which dishonours some men inspires others with a love for work. "So that these inequalities, inevitable because they are necessary, are present in the successive lives we pass through. There is nothing in them contrary to universal harmony; rather, they are a means for effecting this harmony, and are the inevitable result of the difference in value that bodies possess. Besides, no man remains stationary; all advance at a more or less rapid rate of progress.... "When faith is born, it is an illumination. Since man's immortality is one progressive advance, and, to effect this, he prepares the life he enters by the life he is leaving; since, in short, there are necessarily two worlds, one material, the other intellectual, these two worlds, which make up the life to come, must be in harmonious relationship with our own. "Man's work will, therefore, be a continuation of his past work.... "I would never believe that our intelligence, which begins to develop in this life, comes to a halt after such an imperfect growth, and is not exercised or perfected after death.... "... Nature always advances, always labours, because God is life and he is eternal, and life is the progressive movement in the direction of the supreme good, which is God himself. Could man alone in the whole of nature, man so imperfect and full of faults, stop in his onward course, either to be annihilated, or suddenly, without participating in it, though he was created free, find that he was as perfect as he could possibly be? This is more than I can understand. "No, when the time comes, man will not find that his life has been useless, a thing for mere contemplation; he will not find that he is improved without personal participation therein, without effort and toil on his part; above all, he will not be reduced to a state of nothingness. He will again have a life of toil; he will participate, to the extent God has permitted him, in the endless creations produced by divine omnipotence; he will again love, he will never cease to love; he will continue his eternal progress, because the distance between himself and God is infinite." Pierre Leroux says: