Evolution of human consciousness?

What does Bahá’u’lláh hold to be the goal of the evolution of human consciousness?
Within the context of the history of civilization, the objective of the succession of divine Manifestations has been to prepare human consciousness for the race’s unification as a single species, indeed as a single organism capable of taking up the responsibility for its collective future: “He Who is your Lord, the All-Merciful,” Bahá’u’lláh says, “cherisheth in His heart the desire of beholding the entire human race as one soul and one body.”
Not until humanity has accepted its organic oneness can it meet even its immediate challenges, let alone those that lie ahead: “The well-being of mankind,” Bahá’u’lláh insists, “its peace and security, are unattainable unless and until its unity is firmly established.”

Bahá’u’lláh, Bahá'í International Community.