The other kind of human knowledge is intellectual-- that is to say, it is a reality of the intellect; it has no outward form and no place and is not perceptible to the senses. For example, the power of intellect is not sensible; none of the inner qualities of man is a sensible thing; on the contrary, they are intellectual realities. So love is a mental reality and not sensible; for this reality the ear does not hear, the eye does not see, the smell does not perceive, the taste does not discern, the touch does not feel. Even ethereal matter, the forces of which are said in physics to be heat, light, electricity and magnetism, is an intellectual reality, and is not sensible. In the same way, nature, also, in its essence is an intellectual reality and is not sensible; the human spirit is an intellectual, not sensible reality. In explaining these intellectual realities, one is obliged to express them by sensible figures because in exterior existence there is nothing that is not material. Therefore, to explain the reality of the spirit--its condition, its station--one is obliged to give explanations under the forms of sensible things because in the external world all that exists is sensible. For example, grief and happiness are intellectual things; when you wish to express those spiritual qualities you say: "My heart is oppressed; my heart is dilated," though the heart of man is neither oppressed nor dilated. This is an intellectual or spiritual state, to explain which you are obliged to have recourse to sensible figures. Another example: you say, "such an individual made great progress," though he is remaining in the same place; or again, "such a one's position was exalted," although, like everyone else, he walks upon the earth. This exaltation and this progress are spiritual states and intellectual realities, but to explain them you are obliged to have recourse to sensible figures because in the exterior world there is nothing that is not sensible.
So the symbol of knowledge is light, and of ignorance, darkness; but reflect, is knowledge sensible light, or ignorance sensible darkness? No, they are merely symbols. These are only intellectual states, but when you desire to express them outwardly, you call knowledge light, and ignorance darkness. You say: "My heart was gloomy, and it became enlightened." Now, that light of knowledge, and that darkness of ignorance, are intellectual realities, not sensible ones; but when we seek for explanations in the external world, we are obliged to give them a sensible form.
Then it is evident that the dove which descended upon Christ was not a material dove, but it was a spiritual state, which, that it might be comprehensible, was expressed by a sensible figure. Thus in the Old Testament it is said that God appeared as a pillar of fire: this does not signify the material form; it is an intellectual reality which is expressed by a sensible image.
Christ says, "The Father is in the Son, and the Son is in the Father." Was Christ within God, or God within Christ? No, in the name of God! On the contrary, this is an intellectual state which is expressed in a sensible figure.
We come to the explanation of the words of Bahá'u'lláh when He says: "O king! I was but a man like others, asleep upon My couch, when lo, the breezes of the All-Glorious were wafted over Me, and taught Me the knowledge of all that hath been. This thing is not from Me, but from One Who is Almighty and All-Knowing."+F2 This is the state of manifestation: it is not sensible; it is an intellectual reality, exempt and freed from time, from past, present and future; it is an explanation, a simile, a metaphor and is not to be accepted literally; it is not a state that can be comprehended by man. Sleeping and waking is passing from one state to another. Sleeping is the condition of repose, and wakefulness is the condition of movement. Sleeping is the state of silence; wakefulness is the state of speech. Sleeping is the state of mystery; wakefulness is the state of manifestation.
For example, it is a Persian and Arabic expression to say that the earth was asleep, and the spring came, and it awoke; or the earth was dead, and the spring came, and it revived. These expressions are metaphors, allegories, mystic explanations in the world of signification.
Briefly, the Holy Manifestations have ever been, and ever will be, Luminous Realities; no change or variation takes place in Their essence. Before declaring Their manifestation, They are silent and quiet like a sleeper, and after Their manifestation, They speak and are illuminated, like one who is awake.