19. Moral progress alone can assure the happiness of men upon the Earth by putting a rein upon their bad passions. It alone can make harmony, peace, and fraternity reign between them.
It is this which will break down the barriers between them, which will destroy the prejudices of caste, silence the antagonisms of sects, by teaching men to regard themselves as brothers called to aid one another, and not to live at the expense of one another.
It is moral progress, seconded by the progress of intelligence, which will lead men to one belief established upon the eternal truths, not subject to discussion; and for this accepted by all.
The unity of belief will be the most powerful bond of union, the most solid foundation for universal fraternity, which has always been broken by religious antagonisms, which divides people and families, which makes one see in a neighbor a person to avoid – one to combat, exterminate – instead of a brother whom we should love.