Know ye, verily, that the happiness of mankind lieth in the unity and the harmony of the human race, and that spiritual and material developments are conditioned upon love and amity among all men... Similarly, consider how the cause of the welfare, happiness, joy and comfort of humankind are amity and union, whereas dissension and discord are most conducive to hardship, humiliation, agitation and failure.
—‘Abdu’l-Bahá, Selections from the Writings of
