"Know also that the soul is endowed with two wings: should it soar in the atmosphere of love and contentment, then it will be related to the All-Merciful, and should it fly in the atmosphere of self and desire, then it will pertain to the Evil One ..."

"Know that the soul which is common to all men cometh forth following the commingling of things and after their maturation, as thou dost observe in the germ: once it hath developed to its predestined stage, God manifesteth the soul that was latent within it. Thy Lord, verily, doeth what He willeth and ordaineth what He pleaseth. 

As to the soul which is intended, in truth it hath been called forth by the Word of God and is such that, if it be kindled with the fire of the love of its Lord, neither the waters of opposition nor the oceans of the world can quench its flame. That soul is indeed a fire ablaze in the tree of man which proclaimeth: “No God is there but Him!” Whosoever hearkeneth unto its call is verily of those who have attained unto Him. And when it casteth off its earthly frame, God shall raise it up again in the most excellent of forms and cause it to enter a sublime paradise. Thy Lord, of a certainty, hath power over all things. 

Know, furthermore, that the life of man proceedeth from the spirit, and the spirit turneth to wheresoever the soul directeth it. Ponder upon that which We have revealed unto thee that thou mayest recognize the Soul of God which hath appeared above the Dayspring of bounty invested with manifest sovereignty. 

Know also that the soul is endowed with two wings: should it soar in the atmosphere of love and contentment, then it will be related to the All-Merciful, and should it fly in the atmosphere of self and desire, then it will pertain to the Evil One; may God shield and protect us and protect you therefrom, O ye who perceive! Should the soul become ignited with the fire of the love of God, it is called benevolent and pleasing unto God, but should it be consumed with the fire of passion, it is known as the concupiscent soul. Thus have We expounded this subject for thee that thou mayest obtain a clear understanding."

~Bahá'u'lláh

(The Summons of the Lord of Hosts)