Down" is used many different ways, and its spiritual meaning in the Bible is highly dependent on context. Phrases like "bowing down," "lying down" and "falling down" are defined primarily by "bowing," "lying" and "falling"; there is also a great difference between a person descending, the Lord sending fire from heaven and someone handling an object, to offer a few examples. In a very general sense, though, "down" indicates a lowering from more internal spiritual states to more external ones. That's why the journey is described as going "down" to Egypt from Canaan, and people from all quarters go "up" to Jerusalem. It's also why the Lord comes "down" to us, which generally indicates a state of judgment.

642. 14:14 Then I looked, and behold, a white cloud, and on the cloud sat One like the Son of Man. This symbolizes the Lord in relation to the Word.

A cloud symbolizes the Word in its literal sense, and a white cloud the Word in its literal sense as to what it is like interiorly. And the Son of Man means the Lord in relation to the Word. Therefore we are told that on the cloud sat One like the Son of Man.

That a cloud symbolizes the Word in respect to its literal sense may be seen in nos. 24, 513 above. A white cloud symbolizes the literal sense of the Word as to what it is like interiorly because whiteness is predicated of truths in a state of light (nos. 167, 367), and the literal sense has interiorly within it spiritual truths, which appear in the light of heaven. That the Son of Man means the Lord in relation to the Word may be seen in no. 44 above, and confirmed by numerous proofs in The Doctrine of the New Jerusalem Regarding the Lord, nos. 19-28.

[2] The Lord often said that His disciples would see the Son of Man coming on the clouds of heaven. He said this in Matthew 24:30; 26:64, Mark 14:61-62, Luke 21:27, and no one knows that this symbolically means anything else than that when He comes to execute judgment He will appear on clouds in the sky. But this is not what it means. Rather it means that when He comes to judge, He will appear in the literal sense of the Word; and because He has now come, He has appeared therefore in the Word by revealing the existence of a spiritual meaning in every particular of the Word's literal sense, having the Lord alone in it as its subject, teaching that He alone is God of heaven and earth.

This is what is meant by the Lord's coming on the clouds of heaven.

That every particular of the Word's literal sense has in it a spiritual meaning, that this has the Lord alone in it as its subject, and that He alone is God of heaven and earth, is something we have shown in two Doctrines of the New Jerusalem - The Doctrine of the New Jerusalem Regarding the Lord, and The Doctrine of the New Jerusalem Regarding the Sacred Scripture.

[3] Because the Lord's coming on the clouds of heaven means His coming in His Word, at a time when He is ready to execute judgment, and because this is the subject of the book of Revelation, therefore we are told there, "Behold, He is coming with clouds" (Revelation 1:7). And in the present verse, "I looked, and behold, a white cloud, and on the cloud sat One like the Son of Man."

Moreover, in The Acts of the Apostles we are told:

...while they watched, (Jesus) was taken up (into heaven), and a cloud received Him out of their sight... And... two men... in white apparel... said, ."..This same Jesus, who was taken up... into heaven, will so come in like manner as you saw Him go into heaven." (Acts of the Apostles 1:9-11)

A cloud symbolizes the Word's literal sense because that sense is natural, and in the sight of angels, whose light is a spiritual light, Divine truth in natural light appears as a cloud - as a white cloud in the case of people who possess genuine truths from the Word's literal sense, as a dark cloud in the case of people who lack genuine truths, as a black cloud in the case of people caught up in falsities, and as a black cloud combined with fire in the case of people caught up in a faith divorced from charity, because they are engaged in evil practices. I have witnessed it.