Therefore a religion, even if it calls itself the religion of love, must be hard and unloving to those who do not belong to it. Fundamentally indeed every religion is in this same way a religion of love for all those whom it embraces; while cruelty and intolerance towards those who do not belong to it are natural to every religion. However difficult we may find it personally, we ought not to reproach believers too severely on this account; people who are unbelieving or indifferent are so much better off psychologically in this respect. If to-day that intolerance no longer shows itself so violent and cruel as in former centuries, we can scarcely conclude that there has been a softening in human manners. The cause is rather to be found in the undeniable weakening of religious feelings and the libidinal ties which depend upon them. If another group tie takes the place of the religious one—and the socialistic tie seems to be succeeding in doing so—, then there will be the same intolerance towards outsiders as in the age of the Wars of Religion; and if differences between scientific opinions could ever attain a similar significance for groups, the same result would again be repeated with this new motivation.