[The discourse presented here was edited by the Rebbe and printed for Beis Iyar 5751 (1991), and with retrospect we can see how it is meant to guide us and strengthen us through the present time (even more so than when it was published), as will be explained, בע”ה.
The haftorah that is read when Shabbos falls out in Erev Rosh Chodesh (the day before the new month when the moon is completely concealed) begins with the verse: “Yehonosan said to him: tomorrow is [Rosh] Chodesh and you will be remembered (נפקדת) because your place will be vacant (כי יפקד מושבך).”
The words of this verse demand explanation: why are words from the same root — נפקדת and כי יפקוד — used for completely opposite concepts? “You will be remembered” is seemingly quite the opposite from “your place will be vacant”, which implies that he will be missing?! To explain…