At the beginning of this manifestation, Love is, in the purity of its origin, composed of two movements, two complementary poles of the impulsion towards complete fusion. On one side, it is the supreme power of attraction and on the other the irresistible need of absolute self-giving. ...What was projected into space had to be brought back to itself without, however, destroying the universe so created. Therefore Love burst forth, the irresistible power of union.

  Is it not love, under an erring and obscure form, that is associated with all the impulsions of the physical and vital nature as the push towards every movement and every grouping? This has become quite visible in the plant world. In the plant and the tree, it is the need of growth to get more light, more air , more space; in the flower it is the gift of beauty and fragrance in a loving efflorescence. And in the animal is it not there behind hunger and thirst, the need for appropriation, expansion, procreation, in brief behind all desire, whether conscious or not? And, among the higher orders, in the self-sacrificing devotion of the female for her young ones ? This naturally leads us to the human species where, with the triumphant advent of mental activity this association attains its climax, for it is there conscious and deliberate.

   It is also from this very moment that there has clearly appeared in Nature's works her will to build up again, by stages and degrees, the primordial unity through groupings more and more complex and numerous. She used the power of love for bringing two human beings together and creating the dual group, the origin of family. Once she had broken the narrow limits of personal egoism by changing it into a dual egoism, she brought into being, with the appearance of the child, a more complex unit, the family. In course of time through manifold association between families, interchange between individuals and blood mixture, larger groupings appeared: the clan, the tribe, the caste and the class to end in the creation of the nation. The work of group formation proceeded simulta neously in different parts of the world; it has crystallised in the formation of different races. Even these races Nature will by degrees fuse together in her endeavour to build a material and real basis for human unity.
                                 

  THE MOTHER, The Four Austerities and the Four Liberations, III