The purpose of the creation of man is...

The purpose of the creation of man is the attainment of the supreme virtues of

humanity through descent of the heavenly bestowals. The purpose of man’s creation is, therefore, unity and harmony, not discord and separateness. If the atoms which compose the kingdom of the minerals were without affinity for each other, the earth would never have been formed, the universe could not have been created. Because they have affinity for each other, the power of life is able to manifest itself, and the organisms of the phenomenal world become possible. When this attraction or atomic affinity is destroyed, the power of life ceases to manifest; death and nonexistence result....
When the souls become separated and selfish, the divine bounties do not descend, and the lights of the Supreme Concourse are no longer reflected even though the bodies meet together. A mirror with its back turned to the sun has no power to reflect the sun’s effulgence. Praise be to God! The purpose of this assembly is love and unity.

'Abdu'l-Baha, The Promulgation of Universal Peace, p. 4