31. By the communications that man can now establish with those who have left the Earth, he receives not only the material proof of the existence and individuality of the soul, but he comprehends the solidarity which joins the living and the dead in this world, and those of this world with those of other worlds. He knows their situation in the world of spirits; he follows them in their migrations; he can testify of their joys and sorrows; he knows why they are happy or unhappy and the end which awaits all, according to the good or evil they accomplished. These communications introduce him to a future life, which he can observe in all its phases and conditions. The future is no more a vague hope; it is a positive fact, a mathematical certitude. Thus he has no more fear of death; it is for him a deliverance, the gate of true life.