Like most numbers in the Bible, "six" can have various meanings depending on context, but has a couple that are primary. When used in relation to time -- six days, six hours, six years, etc. -- six generally represents a state of labor, struggle and conflict, especially the conflict involved with spiritual growth. The six days of creation, for instance, represent the stages we go through in our lives, working toward the peaceful seventh day, in which our evil desires are removed from us and we can rest. In most other references, six represents all desires for good and all the true ideas that come from those desires for good -- or in the contrary sense, all evil and all the resulting false thinking.

273. (Verse 5) And out of the throne proceeded lightnings, and thunderings, and voices. That this signifies enlightenment, understanding, and perception of the Divine truth in the heavens from the Lord is evident from the signification of lightnings, thunderings and voices, as being said of the Divine truth; lightnings of its enlightenment, thunderings of its understanding, and voices of its perception; that these things are signified will be evident from the passages in the Word where they are mentioned. But something shall first be said concerning the ground of those significations. All the things seen in the visible heaven by the eyes of men are correspondences; as the sun, the moon, the stars, the air, the ether, light, heat, clouds, mists, showers, and many others; they are correspondences because all the things in the natural world correspond to those that are in the spiritual world. Those things are also correspondences in heaven, where the angels are, since similar things are seen by them; but there they are not natural but spiritual, as is evident from what is shown respecting them in Heaven and Hell. For example, concerning the sun and the moon in heaven (n. 116-125); concerning light and heat in heaven (n. 126-140); and in general concerning the correspondence of heaven with all things on earth (n. 103-115); and concerning appearances in heaven (n. 170-176). Hence also lightnings and thunderings are correspondences; and because they are correspondences, they signify those things to which they correspond; in general they signify the Divine truth received and uttered by the higher angels, which, when it descends to the lower angels, is sometimes seen as lightning, and heard as thunder with voices. This is why lightning signifies the Divine truth as to enlightenment; thunder, the Divine truth as to understanding; and voices, the Divine truth as to perception.

It is said as to understanding and as to perception, because what enters by hearing into the mind is both seen and perceived; it is seen in the understanding, and it is perceived by communication with the will. (What is properly perception, such as the angels in heaven enjoy, may be seen in The Doctrine of the New Jerusalem 140.)

[2] This, now, is why lightnings and thunders in the Word signify Divine truth as to enlightenment and as to understanding, as is evident from the following passages. In David:

"Thou hast with thine arm redeemed thy people. The clouds dropped waters; the skies uttered a voice; thine arrows also went abroad; the voice of thy thunder into the world; the lightnings lightened the world" (Psalms 77:15, 17, 18).

The subject treated of in this Psalm is the establishment of the church anew; by the clouds dropping waters are signified truths from the sense of the letter of the Word; by the skies, or higher clouds, uttering a voice, are signified truths from the spiritual sense of the Word; by the arrows which went abroad are meant thunderbolts, from which there appear as it were arrows from a bow, these being present when there are thunders and lightnings, and by them are signified Divine truths; by the voice of thunder into the world is signified Divine truth as to perception and understanding in the church; and by the lightning lightening the world is signified enlightenment: the world signifies the church.

[3] Again:

"A fire shall go before" Jehovah, "and burn up his enemies round about. His lightnings shall enlighten the world" (Psalms 97:3, 4).

From these words also it is evident that lightnings signify Divine truth as to enlightenment: for it is said his lightnings shall enlighten the world.

[4] In Jeremiah:

"The maker of the world by his power, he prepareth the world by his wisdom, and by his intelligence stretcheth out the heavens; at the voice which he giveth there is a multitude of waters in the heavens, and he maketh the vapours to ascend from the end of the earth, he maketh the lightnings of the rain" (10:12, 13; 51:16; Psalms 135:7).

Here also the establishment of the church is treated of. That by the voice of thunder is signified the Divine truth as to perception and understanding, and by lightnings the same as to enlightenment is evident from its being said that the maker of the earth prepareth the world by His wisdom, and stretcheth out the heavens by His intelligence; and immediately after, that when He uttereth His voice there is a multitude of waters in the heavens, and that He maketh lightnings of the rain. The earth and the world signify the church; waters in the heavens signify spiritual truths; rain signifies the same when they descend and become natural; their enlightenment is signified by lightnings.

[5] In the second book of Samuel:

"Jehovah thundered from heaven, and the most High uttered his voice, and sent arrows, and scattered them; lightning, and confounded them" (22:14, 15).

Thunders are here expressed by thundering from heaven, and by uttering a voice; flying thunderbolts by arrows; and by both are signified Divine truths, and by lightning, their light. And as these quicken and enlighten the good, so they affright and blind the wicked; which is meant by His sending arrows and scattering them, lightning, and confounding them for the evil cannot sustain Divine truths, nor any light at all from heaven, therefore they flee away from their presence.

[6] Similarly in David:

"Jehovah also thundered in the heavens, and the Highest uttered his voice, and sent his arrows, and scattered them and many thunderbolts, and discomfited them" (Psalms 18:13, 14).

And elsewhere:

"Hurl thy lightning, and scatter them; send forth thine arrows, and destroy them" (Psalms 144:6).

That thunders and lightnings signify the Divine truth as to understanding and as to enlightenment is still further evident from the following passages. In David:

"Thou calledst in trouble, and I delivered thee; I answered thee in the secret place, in thunder" (Psalms 81:7).

In the Apocalypse:

"And I heard as it were the voice of thunder, and one of the four animals saying, Come and see" (6:1).

Again:

"The angel took the censer, and filled it with fire of the altar, and cast it into the earth; and there were thunderings, voices, and lightnings" (8:5).

Again:

The angel "cried with a loud voice, as a lion; and when he cried seven thunders uttered their voices" (10:3, 4).

Again:

"The temple of God was opened in heaven, and there was seen in the temple the ark of the covenant; and there were lightnings, and voices, and thunderings" (11:19).

Again:

"I heard a voice from heaven, as the voice of many waters, and as the voice of a great thunder" (14:2).

And again:

"I heard as it were the voice of a great multitude, and as the voice of many waters, and as the voice of mighty thunderings, saying, Alleluia, for the Lord our God omnipotent reigneth" (19:6).

Because thunders and lightnings signify Divine truths, therefore also when Jehovah descended upon Mount Sinai to promulgate them,

"There were voices, and lightnings, and also the voice of a trumpet" (Exodus 19:16).

That the voice of a trumpet signifies Divine truth as to revelation, may be seen above (n. 55, 262.) The voice which came from heaven to the Lord was also heard as thunder, as may be seen in John (12:28, 29); and James and John were called Boanerges, or sons of thunder (Mark 3:14, 17).