'Sons of the stranger' signify counterfeit truths, or falsities. 'Our sons' signify the doctrines of truth, and 'our daughters,' the doctrines of good, as in Psalm 144:11-12.

(Референци: Arcana Coelestia 489; Psalms 144:11)

The three words, sword, famine and pestilence, appear in a group in 26 different Bible verses. That's not an accident. Sword, famine and pestilence describe a trio of bad things that can happen to us physically.

In the Word, those three words describe spiritual destruction we can bring upon ourselves if we believe false ideas and develop evil habits.

In Apocalypse Revealed 323, we read that:

1) a sword means the destruction of spiritual life by falsities,

2) famine means the destruction of spiritual life by evils

3) pestilence means a complete destruction.

Rev. Jonathan Rose provides an interesting Bible Study on this subject, in a related video, shown here.