Rav Shlomo Katz learns from Sichot HaRan 41, where Rebbe Nachman makes a life-changing distinction: atzvut (destructive sadness) and lev nishbar (a broken heart) are not the same. Sadness, rooted in despair and complaint, belongs to the sitra achra and leads to paralysis. A broken heart, however, is beloved before Hashem — an honest cry of the soul that, at its core, contains joy because it expresses the yearning to return and draw close. Rebbe Nachman teaches that one should set aside time each day to pour out a broken heart before Hashem, but never give space to sadness, which only seals the heart.