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.

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

728. That 'seven days' time' here means the onset of temptation is clear from the internal sense of all the details in this verse, where the subject is the temptation of the man called Noah. In general the subject concerns not only the temptation of that man but also the utter vastation of those who belonged to the Most Ancient Church and who had become such as described. Consequently 'seven days' time' means not only the onset of temptation but also the finish of vastation. The reason 'seven days' time' means those things is that seven Is a holy number, as stated and shown at verse 2 of this chapter, at Genesis 4:15, 24, and in 84-87. It means the Lord's Coming into the world, and also His coming into glory. In particular it means every coming He makes. Every one of His comings involves a beginning for those who are being regenerated and the end of those who are being vastated. And so for the member of this Church His coming marked the onset of temptation, for when someone is being tempted he starts to become a new man and be regenerated. At the same time it was the end of those from the Most Ancient Church who had become of such a character that inevitably they perished. It was similar when the Lord came into the world; at that time the Church had entered the final stages of its vastation, and a new one came into being.

[2] That 'seven days' time' means these things is clear in Daniel,

Seventy weeks have been decreed concerning your people and your holy city to bring transgression to a close and to seal up sins and to atone for iniquity and to bring in everlasting righteousness, and to seal up vision and prophet, and to anoint the Most Holy Place. And you will know and perceive that from the going forth of the Word to restore and to build Jerusalem until the Messiah, the Prince, there will be SEVEN WEEKS. Daniel 9:24-25.

Here 'seventy weeks' and 'seven weeks' are similar in meaning to seven days, namely the Coming of the Lord. But because it is plain prophecy here, periods of time are presented in an even more holy and decided fashion by numbers involving seven. From this quotation it is clear that, when applied in this way to periods of time, 'seven' means not only the Coming of the Lord, but also - in the words stating that He was to anoint the Most Holy Place and that He was to restore and build Jerusalem - the beginning of a new Church at that time, and simultaneously - in the words stating that [seventy] weeks were decreed concerning the holy city to bring transgression to a close and to seal up sin - final vastation.

[3] Similar usages occur elsewhere in the Word, as in Ezekiel where he describes a personal experience,

I came to those in captivity at Tel-abib, who were sitting by the river Chebar, and I sat there seven days, astonished among them And at the end of seven days the Word of Jehovah came to me. Ezekiel 3:15-16.

Here also 'seven days' stands for the onset of visitation, for when he had sat seven days among those in captivity, the Word of Jehovah came to him. In the same prophet,

They will bury Gog, that they may cleanse the land in seven months. At the end of seven months they will make their search. Ezekiel 39:12, 14.

This similarly stands for the final phase of vastation and the first of visitation. In Daniel,

The heart of Nebuchadnezzar will be changed from a man and the heart of a beast given to him, and seven times will pass over him. Daniel 4:16, 25, 31.

This likewise stands for the finish of vastation and the beginning of a new man.

[4] The seventy years of captivity in Babylon represented the same. Whether the number is seventy or seven what is embodied is the same. The same applies whether it is seven days, or seven years, or seven decades which make seventy years. Vastation was represented by the years of captivity, the beginning of a new Church by the liberation and by the rebuilding of the Temple. Jacob's serving in the house of Laban also represented things of a similar nature - where the following is stated,

I will serve you for seven years for Rachel. And he served for seven years. Laban said, Complete the week of this one, and we will give you also the other one for the service you render with me for another seven years. And Jacob did so, and completed the week of this one. Genesis 29:18, 20, 27-28.

Here 'the service of seven years' embodies something similar. And after the period of seven years marriage and freedom followed. The period of these seven years was called a week, as also in Daniel.

[5] Something similar was also represented by the command to go around the city of Jericho seven times, and the wall would collapse. It is also said that they rose at dawn on the seventh day and went around the city, as they were accustomed to do, seven times. And after the seventh time round, the seven priests blew on their seven trumpets and the wall collapsed, Joshua 6:10-20. Unless these events had also had this meaning the command would never have been given to go round seven times, or that there were to be seven priests and seven trumpets. From these and many other places, for example in Job 2:13; Revelation 15:1, 6-7; 21:9, it becomes clear that 'seven days' time' means the beginning of a new Church and the end of the old. Since the subject here is not only the member of the Church called Noah and his temptation, but also the final descendants of the Most Ancient Church who destroyed themselves, 'seven days' time' can mean nothing other than the onset of the temptation of Noah and the finish of the Most Ancient Church, which was the final destruction and extinction of it.

15. And keep the things which are written therein, signifies from the love of truth. This is evident from the signification of "observing" and "keeping," as being to perceive, to will, and to do according thereto, here according to the doctrine of heaven; and from the signification of "the things which are written therein," as being, from the love of truth, or from the delight of that love; for what is done from love is done from delight; delight is from no other source. This is signified by "the things which are written therein," because the things contained in the doctrine of heaven are written on the heart, and thus on the life, of those here described; and things written on the heart and life are written on the love; for "heart" in the Word signifies love (Arcana Coelestia 7542, 9050, 10336). The love of truth is meant, because these things are said of the doctrine of heaven, and the doctrine of heaven is from truths. In the Word frequent mention is made of observing and keeping the precepts, the commandments, the words, and the law: and by observing and keeping is there signified to understand, to will, and to do, as in Matthew:

Teaching them to observe all things whatsoever I commanded you (Matthew 28:20);

in Luke:

Blessed are they that hear the Word of God and keep it (Luke 11:28);

in John:

Verily, verily, I say unto you, if anyone keep My word he shall never see death (John 8:51);

in the same:

If any one love Me he will keep My word: He that loveth Me not, keepeth not My words (John 14:15, 23-24);

and in the same:

If ye keep My commandments ye shall abide in My love. Ye are My friends if ye do the things which I command you (John 15:10, 14).

To do is to will, and to will is to do; because in deeds the will is everything.