... any country that is not careful can be seized.

Work is what horses die of

Justice is conscience, not a personal conscience but the conscience of the whole of humanity. Those who clearly recognize the voice of their own conscience usually recognize also the voice of justice.

... mutual lack of understanding carries the threat of imminent and violent destruction.

Surely people should eventually cease to be surprised at anything? And yet they continue to be.

But what can you say in a letter?

When I was in the gulag I would sometimes even write on stone walls. I used to write on scraps of paper, then I memorised the contents and destroyed the scraps.