The supreme need of humanity is...

cooperation and reciprocity

 
In any given community, the culture it promotes, the attitudes it fosters, and the patterns of thought and behaviour it cultivates, are largely defined by its members’ collective sense of purpose. When that purpose is to contribute to the betterment of society, the community becomes a setting in which powers are multiplied in unified action, where individual will and collective volition are blended, and where the spirit of enterprise is reinforced by a realization of the need for concerted action and a commitment to the common good.
 “The supreme need of humanity is cooperation and reciprocity,” said ‘Abdu’l-Bahá. “The stronger the ties of fellowship and solidarity amongst men, the greater will be the power of constructiveness and accomplishment in all the planes of human activity.” In the same way that the human being is more than the sum of the individual cells which comprise its body, so too the powers of a unified community far exceed the combined powers of its individual members.

What Bahá’ís Believe, Essential Relationships