In this shiur the Aish Kodesh explains two different types of giving. 1. Hashem simply gives because He is giving, not because we are deserving. 2. Hashem pays back a "debt" so to speak and gives us what we are owed for the performance of our Mitzvos.
The Rebbe teaches that there are two types of Jews, those who are lost and those are completely unrecognizable. In 1939 the Rebbe addresses those Jews that have completely lost their sense of self because of the persecution of the Nazi's. The Rebbe speaks to how Hashem will restore these Jews to their previous pristine state.