The Rebbe said this discourse on the last day of Pesach in 1965. The Haftorah for this day focuses on Moshiach, and the Chabad custom is to have a final meal in the late afternoon with Matza and four glasses of wine, a kind of repeat of the Seder, but relating not to the Exodus from Egypt in the past, but to the coming of Moshiach in the (immediate) future.  The discourse is a fascinating discussion of the role of Moshiach as Teacher and as King.  As King, he can communicate a deeper dimension of connection to the Divine.