_The cardinal question is that of sin._ The question of immanence or of dualism is secondary. The trinity, the life to come, paradise and hell, may cease to be dogmas, and spiritual realities, the form and the letter may vanish away, the question of humanity remains: What is it which saves? How can man be led to be truly man? Is the ultimate root of his being responsibility, yes or no? And is doing or knowing the right, acting or thinking, his ultimate end? If science does not produce love it is insufficient. Now all that science gives is the _amor intellectualis_ of Spinoza, light without warmth, a resignation which is contemplative and grandiose, but inhuman, because it is scarcely transmissible and remains a privilege, one of the rarest of all. Moral love places the center of the individual in the center of being. It has at least salvation in principle, the germ of eternal life. _To love is virtually to know; to know is not virtually to love_; there you have the relation of these two modes of man. The redemption wrought by science or by intellectual love is then inferior to the redemption wrought by will or by moral love. The first may free a man from himself, it may enfranchise him from egotism. The second drives the _ego_ out of itself, makes it active and fruitful. The one is critical, purifying, negative; the other is vivifying, fertilizing, positive. Science, however spiritual and substantial it may be in itself, is still formal relatively to love. Moral force is then the vital point. And this force is only produced by moral force. Like alone acts upon like. Therefore do not amend by reasoning, but by example; approach feeling by feeling; do not hope to excite love except by love. Be what you wish others to become. Let yourself and not your words preach for you. Philosophy, then, to return to the subject, can never replace religion; revolutionaries are not apostles, although the apostles may have been revolutionaries. To save from the outside to the inside--and by the outside I understand also the intelligence relatively to the will--is an error and danger. The negative part of the humanist’s work is good; it will strip Christianity of an outer shell, which has become superfluous; but Ruge and Feuerbach cannot save humanity. She must have her saints and her heroes to complete the work of her philosophers. Science is the power of man, and love his strength; man _becomes_ man only by the intelligence, but he _is_ man only by the heart. Knowledge, love, power--there is the complete life.