Spiritual Source of the Nations 2

The Nations are derived from the impure aspects of creation while Israel is derived from the pure. If this is so then how it possible that the Nations can be held accountable for their actions? What is the motivation for the good deeds that they do?
Class 2
This is a letter by the Rebbe in Igros Kodesh volume 1 letter 14.
The text is available at hebrewbooks.or...