This class if based on a chassidic discourse by the Rebbe from the year 1976. In that discourse the Rebbe discusses the difference between two stories in Torah that involve spies: Moshe (parashat Shlach) and Yehoshua (Beginning of the Book of Yehoshua). Based on those differences, lessons are extracted.

The original text can be found here:
https://tuviaserber.com/and-yehoshua-sent-spies-5736/