"...is not the object of every Revelation to effect a transformation in the whole character of mankind, a transformation that shall manifest itself both outwardly and inwardly, that shall affect both its inner life and external conditions? For if the character of mankind be not changed, the futility of God’s universal Manifestations would be apparent."
Bahá’u’lláh: The Kitáb-i-Íqán, paragraph 270, p. 222
"O my God, the God of bounty and mercy! Thou art that King by Whose commanding word the whole creation hath been called into being; and Thou art that All-Bountiful One the doings of Whose servants have never hindered Him from showing forth His grace, nor have they frustrated the revelations of His bounty."
Bahá’u’lláh: Prayers and Meditations, Selection CLIX, p. 251
"The purpose underlying Their revelation hath been to educate all men, that they may, at the hour of death, ascend, in the utmost purity and sanctity and with absolute detachment, to the throne of the Most High. The light which these souls radiate is responsible for the progress of the world and the advancement of its peoples. They are like unto leaven which leaveneth the world of being, and constitute the animating force through which the arts and wonders of the world are made manifest. Through them the clouds rain their bounty upon men, and the earth bringeth forth its fruits. All things must needs have a cause, a motive power, an animating principle. These souls and symbols of detachment have provided, and will continue to provide, the supreme moving impulse in the world of being."
Bahá’u’lláh: Gleanings from the Writings of Bahá’u’lláh, Selection LXXXI, p. 157