"We are closer to man than his life-vein"

Behold, how immeasurably exalted is the Lord your God above all created things! Witness the majesty of His sovereignty, His ascendancy, and supreme power. If the things which have been created by Him -- magnified be His glory -- and ordained to be the manifestations of His names and attributes, stand, by virtue of the grace with which they have been endowed, exalted beyond all proximity and remoteness, how much loftier must be that Divine Essence that hath called them into being?...
Meditate on what the poet hath written: "Wonder not, if my Best-Beloved be closer to me than mine own self; wonder at this, that I, despite such nearness, should still be so far from Him."... Considering what God hath revealed, that "We are closer to man than his life-vein," the poet hath, in allusion to this verse, stated that, though the revelation of my Best-Beloved hath so permeated my being that He is closer to me than my life-vein, yet, notwithstanding my certitude of its reality and my recognition of my station, I am still so far removed from Him. By this he meaneth that his heart, which is the seat of the All-Merciful and the throne wherein abideth the splendor of His revelation, is forgetful of its Creator, hath strayed from His path, hath shut out itself from His glory, and is stained with the defilement of earthly desires.

  Baha'u'llah,