Altruistic love of humankind not enough

What is the looked-for result? Loving-kindness among all human creatures and a firm, indestructible brotherhood which includes all the divine possibilities and significances in humanity.

--'Abdu'l-Bahá, Foundations of World Unity

Brotherhood or fraternity is of different kinds. It may be family association, the intimate relationship of the household. This is limited and subject to change and disruption. How often it happens that in a family, love and agreement are changed into enmity and antagonism. Another form of fraternity is manifest in patriotism. Man loves his fellow-men because they belong to the same nativity. This is also limited and subject to change and disintegration, as for instance when sons of the same fatherland are opposed to each other in war, bloodshed and battle. Still another brotherhood or fraternity is that which arises from racial unity, the oneness of racial origin, producing ties of affinity and association. This likewise has its limitation and liability to change, for often war and deadly strife have been witnessed between people and nations of the same racial lineage. There is a fourth kind of brotherhood, the attitude of man toward humanity itself, the altruistic love of humankind and recognition of the fundamental human bond. Although this is unlimited it is nevertheless susceptible to change and destruction. Even from this universal fraternal bond the looked-for result does not appear. What is the looked-for result? Loving-kindness among all human creatures and a firm, indestructible brotherhood which includes all the divine possibilities and significances in humanity. Therefore it is evident that fraternity, love and kindness based upon family, nativity, race or an attitude of altruism are neither sufficient nor permanent since all of them are limited, restricted and liable to change and disruption. For in the family there is discord and alienation; among sons of the same fatherland strife and internecine warfare are witnessed; between those of a given race, hostility and hatred are frequent; and even among the altruists varying aspects of opinion and lack of unselfish devotion give little promise of permanent and indestructible unity among mankind.

"Therefore the Lord of mankind has caused His holy divine Manifestations to come into the world. He has revealed His heavenly books in order to establish spiritual brotherhood, and through the power of the Holy Spirit has made it practicable for perfect fraternity to be realized among mankind. And when through the breaths of the Holy Spirit this perfect fraternity and agreement are established amongst men, this brotherhood and love being spiritual in character, this loving-kindness being heavenly, these constraining bonds being divine, a unity appears which is indissoluble, unchanging and never subject to transformation. It is ever the same and will forever remain the same. For example consider the foundation of the brotherhood laid by His Holiness Christ. Observe how that fraternity was conducive to unity and accord and how it brought various souls to a plane of uniform attainment where they were willing to sacrifice their lives for each other. They were content to renounce possessions and ready to joyously forfeit life itself. They lived together in such love and fellowship that even Galen, the famous Greek philosopher, who was not a Christian, in his work entitled "The Progress of the Nations" says that religious beliefs are greatly conducive to the foundation of real civilization. As a proof thereof he says, "A certain number of people contemporaneous with us are known as Christians. These enjoy the superlative degree of moral civilization. Each one of them is a great philosopher because they live together in the utmost love and good-fellowship. They sacrifice life for each other. They offer worldly possessions for each other. You can say of the Christian people that they are as one person. There is a bond amongst them that is indissoluble in character."

It is evident therefore that the foundation of real brotherhood, the cause of loving co-operation and reciprocity and the source of real kindness and unselfish devotion is none other than the breaths of the Holy Spirit. Without this influence and animus it is impossible. We may be able to realize some degrees of fraternity through other motives but these are limited associations and subject to change. When human brotherhood is founded upon the Holy Spirit, it is eternal, changeless, unlimited.

--'Abdu'l-Bahá, Foundations of World Unity

Read the whole talk here.