Seven, as in Revelation 15:1, signifies everything in an universal sense. The number 'seven' was considered holy, as is well known, because of the six days of creation, and the seventh, which is the celestial self, where peace, rest, and the Sabbath is. The number seven occurs so frequently in the rites of the Jewish church and is held holy everywhere.

So times were divided into seven, longer and shorter intervals, and were called weeks, like the great intervals of times till the coming of the Messiah, in Daniel 9:24-25. The time of seven years is called 'a week' by Laban and Jacob, as in Genesis 29:27-28. So wherever the number seven occurs, it is considered holy and sacred, as in Psalm 119:164, and in Isaiah 30:26.

As the periods of a person's regeneration are distinguished into six, prior to the seventh, or the celestial self, so the times of vastation are also distinguished, until nothing celestial is left. This was represented by the many captivities of the Jews, and by the last Babylonian captivity, which lasted seven decades, or seventy years. This was also represented by Nebuchadnezzar, in Daniel 4:16, 22, 29. It also refers to the vastation of the end times, in Revelation 15:1, 7-8. They should 'tread the holy city under foot, forty and two months, or six times seven,' as in Revelation 11:2 and Revelation 5:1. So the severity and increments of punishment were expressed by the number seven, as in Leviticus 26:18, 21, 24, 28 and Psalm 79:12.

(რეკომენდაციები: Apocalypse Explained 5, 7-8, 15; Arcana Coelestia 395; Daniel 9, 9:24, 9:25; Psalms 119)

396. 'Jehovah put a sign on Cain, lest anyone should strike him' means that the Lord distinguished faith in a special way to ensure its preservation. This is clear from the meaning of 'a sign' and of 'putting a sign' on somebody, which is a way of distinguishing him, as in Ezekiel,

Jehovah said, Go through the middle of the city, through the middle of Jerusalem, and make a sign on (or designate) the foreheads of the men (vir) who groan and sigh over all the abominations. Ezekiel 9:4.

Here 'designating foreheads' does not mean putting a sign or stroke on their foreheads but a way of distinguishing from others. Something similar is said in John about men who did not have God's sign on their foreheads being subject to condemnation, Revelation 9:4. Here again 'having a sign' stands for a way of distinguishing.

[2] In the same book this sign is also called 'a mark', where reference is made to placing a mark on the hand and on the forehead, Revelation 14:9. That which was meant by signs and marks the Jewish Church represented by binding the first and great commandment on to the hand and on to the forehead, a practice mentioned in Moses,

Hear, O Israel, Jehovah our God is one Jehovah; you shall love Jehovah your God, with all your heart, and with all your soul, and with all your might. And you shall bind them as a sign on to your hand; and let them be as frontlets between your eyes. Deuteronomy 6:4-5, 8; 11:13, 18.

This represented the requirement to distinguish the commandment concerning love above all other commandments. This shows what making a sign on the hand and on the forehead means.

In Isaiah,

One is coming to gather all nations and tongues, and they will come and see My glory, and I will set a sign among them. Isaiah 66:18-19.

And in David,

Look to me and have compassion on me; give Your strength to Your servant, and save the son of Your handmaid. Make a sign in me for what is good, and let those who hate me see and be put to shame. Psalms 86:16-17.

From all these quotations it is now clear what 'a sign' means. Let nobody suppose therefore that some sign was put on a man called Cain, for the internal sense of the Word embodies matters altogether different from those of the sense of the letter.