6401. 'And its rider will fall backwards' means a receding from [truth]. This is clear from the meaning of 'falling backwards' as a receding from - a receding from truth; and from the meaning of 'rider' as those subject to false notions received from lowest nature. 'Horse' means those false notions, see immediately above in 6400, and therefore 'rider' means those subject to them, the nature of which meanings has been discussed immediately above. Since 'Dan' means those within the Church who are the kind of people described just above in 6396 and who are accordingly among the lowest in the Lord's kingdom, 'Dan' also means those who hatch false teachings out of false notions and disseminate them. These people's false teachings are also called 'horses', and their reasonings about truth and good are called 'serpents', in Jeremiah,

From Dan the snorting of his horses was heard; at the sound of the neighing of his strong ones the whole earth quaked. And they came and devoured the land and the fullness of it, the city and those dwelling in it. For behold, I send into you poisonous serpents which do not respond to charming; and they will bite you. Jeremiah 8:16-17.

'Waters' particularly signify the spiritual parts of a person, or the intellectual aspects of faith, and also their opposites.

'The waters above the firmament,' as in Genesis 1:7, signify the knowledges in the internal self, and 'the waters beneath the firmament' signify the knowledges of the external self.

'Waters,' as in Ezekiel 47:9, refer to the New Jerusalem, and they signify spiritual things from a celestial origin.

'Many waters,' as in Revelation 17:1, signify truths of the Word adulterated. 'Waters' or 'rivers' signify spiritual, rational, or scientific things pertaining to truth.

'Waters … that go softly,' as in Isaiah 8:6-7, signify spiritual things, and 'waters … strong and many,' signify falsities.

'Waters,' as in Psalms 104:3, signify divine truths.

'Waters' signify truths in the natural self, and in the opposite sense, falsities.

'The waters were dried up from off the earth,' as in Genesis 8:7, signifies the apparent dissipation of falsities.

(Odkazy: Apocalypse Explained 17; Apocalypse Revealed 50; Genesis 8)