Defying a bevy of "frum" naysayers, who say things like "mussar is dead", not suitable for our time, doesn't fit our generation, is too negative, has been superseded by "Chasidus", and other nonsense, the veritable old discipline of לימוד המוסר continues on, and is even gaining new, enthusiastic, young devotees.
As שלמה המלך, the wisest of men, exhorted us, החזק במוסר אל תרף, נצרה כי היא חייך - Grab onto mussar and don't let go, guard it, as it is your life - the imperative of mussar and introspection is fundamental, as recently expounded upon masterfully at length in Toras Avigdor.
That doesn't mean that everyone must study mussar in the exact same manner as was done under Rav Yisroel Salanter zt"l in Kovno some 150 years ago, or in Slabodka or Novhardok fifty years later. There are multiple schools and paths in mussar, which is a very broad discipline. And one can absorb mussar without being an official "mussar'nik" as well, e.g. by learning sefer Mishlei, other sections of Torah which may not be labeled as such, or a more recent work (such as the great ארחות יושר of Rav Chaim Kanievsky zt"l), rather than more typical mussar seforim more commonly associated with the modern movement.
Hachzek - Daily Mussar Impact - A New High-Tech Mussar Center
In the category of old wine in new vessels, I saw an advertisement for a new mussar endeavor, an organization called החזק, recently, but just checked out their website in earnest this week, and was favorably impressed with the professionalism and sophistication on display. I counted shiurim from twenty (!) maggidei shiur for the latest (brief) mussar yomi installment there (a section from the classic חובות הלבבות, שער הבטחון). And the shiurim are not long, busy people can easily be a part of it, on the go, or at rest, in just circa 5-10 minutes a day.
Take a look, have a listen, check out a video, a sefer, or text there. It may not be exactly how your grandfather got his dose of mussar, but the aura of introspection, striving for self-improvement, and closeness to Hashem that characterizes mussar is still there for sure.
In the zechus of such serious spiritual enterprise, whether older מוסר varieties or newer, or other less common, but still legitimate variations, may we be zoche to גאולה בקרוב.
א גוטען חודש