For some 26 pages, Reb Noson takes the concepts of joy and happiness and relates them to every individual, for every day, in every situation. He begins his discourse as follows:
A person should know that the Rebbe’s lesson on attaining the loftiest of levels, the Great Light of the Infinite, is applicable to every Jew who performs the mitzvot with joy. The Torah was not given to the angels. It was given to us, to those of flesh and blood. Even we can attain the greatest of all levels … simply by being HAPPY (Likutey Halakhot, Hoda’ah 6).