"Your nails and eyes are both parts of your bodies. Do ye regard them of equal rank and value?"

"By the righteousness of My name, the All-Merciful! The Pen of the Most High trembleth with a great trembling and is sore shaken at the revelation of these words. How puny and insignificant is the evanescent drop when compared with the waves and billows of God’s limitless and everlasting Ocean, and how utterly contemptible must every contingent and perishable thing appear when brought face to face with the uncreated, the unspeakable glory of the Eternal! We implore pardon of God, the All-Powerful, for them that entertain such beliefs, and give utterance to such words. Say: O people! How can a fleeting fancy compare with the Self-Subsisting, and how can the Creator be likened unto His creatures, who are but as the script of His Pen? Nay, His script excelleth all things, and is sanctified from, and immeasurably exalted above, all creatures.

Furthermore, consider the signs of the revelation of God in their relation one to another. Can the sun, which is but one of these signs, be regarded as equal in rank to darkness? The one true God beareth Me witness! No man can believe it, unless he be of those whose hearts are straitened, and whose eyes have become deluded. Say: Consider your own selves. Your nails and eyes are both parts of your bodies. Do ye regard them of equal rank and value? If ye say, yea; say, then: ye have indeed charged with imposture, the Lord, my God, the All-Glorious, inasmuch as ye pare the one, and cherish the other as dearly as your own life."

- Bahá'u'lláh, Gleanings From the Writings of Bahá’u’lláh, pp. 187-188 XCIII