Baha'u'llah has announced that no matter how far the world of humanity may advance in material civilization, it is nevertheless in need of spiritual virtues and the bounties of God. The spirit of man is not illumined and quickened through material sources. It is not resuscitated by investigating phenomena of the world of matter. The spirit of man is in need of the protection of the Holy Spirit. Just as he advances by progressive stages from the mere physical world of being into the intellectual realm, so must he develop upward in moral attributes and spiritual graces. In the process of this attainment he is ever in need of the bestowals of the Holy Spirit. Material development may be likened to the glass of a lamp, whereas divine virtues and spiritual susceptibilities are the light within the glass. The lamp chimney is worthless without the light; likewise, man in his material condition requires the radiance and vivification of the divine graces and merciful attributes. Without the presence of the Holy Spirit he is lifeless. Although physically and mentally alive, he is spiritually dead. Christ announced, "That which is born of the flesh is flesh; and that which is born of the Spirit is spirit," meaning that man must be born again. As the babe is born into the light of this physical world, so must the physical and intellectual man be born into the light of the world of Divinity. In the matrix of the mother the unborn child was deprived and unconscious of the world of material existence, but after its birth it beheld the wonders and beauties of a new realm of life and being. In the world of the matrix it was utterly ignorant and unable to conceive of these new conditions, but after its transformation it discovers the radiant sun, trees, flowers and an infinite range of blessings and bounties awaiting it. In the human plane and kingdom man is a captive of nature and ignorant of the divine world until born of the breaths of the Holy Spirit out of physical conditions of limitation and deprivation. Then he beholds the reality of the spiritual realm and Kingdom, realizes the narrow restrictions of the mere human world of existence and becomes conscious of the unlimited and infinite glories of the world of God. Therefore, no matter how man may advance upon the physical and intellectual plane, he is ever in need of the boundless virtues of Divinity, the protection of the Holy Spirit and the face of God.