A 'sword,' as in Ezekiel 21:9-15, signifies a person so desolated that he can see nothing good and true, but only falsities and contradictions. A 'sword,' in the Word, signifies the truth of faith combating and the vastation of truth. In an opposite sense, it signifies falsity combating and the punishment of falsity.

The 'sword,' in Revelation 1:16, represents a dispersion of falsities by the Lord because the sword came out from His mouth, which means it comes from the Word. Because the Word is understood by doctrine taken from it, this is also symbolically meant. It is called a sharp two-edged sword because it pierces the heart and soul.

A 'flaming sword which turned every way,' as in Genesis 3:24, signifies divine truth in extremes, which, like the Word in its literal sense, can be turned.

(Odkazy: Arcana Coelestia 2799)

407. It generally happens with the passage of time that the Church reaches a state when it retreats from true faith and at length ends up with no faith at all. And when faith is no more the Church is said to be vastated. This was what happened to the Most Ancient Church among those called Cainites. It was also what happened to the Ancient Church which came after the Flood, and to the Jewish Church too, which had been so vastated by the time of the Lord's Coming that they did not even know anything about the Lord's coming to save them, still less anything about faith in Him. It was what happened yet again to the Primitive Church - the Church established after the Lord's Coming - which at the present time has been so vastated that there is not any faith there. Nevertheless some nucleus of the Church always remains, although those who have been vastated as to faith do not acknowledge that nucleus, as with the Most Ancient Church, a remnant of which remained up to and survived beyond the Flood. That remnant of the Church is called Noah.