Rabbi Aryeh Leib of Shpole and Rabbi Noach of Lachowicze regarded Purim as an opportunity for great spiritual achievements. Rabbi Issachar Dov Baer of Radoszyce invited barren women to his Purim celebrations and promised them that they would conceive worthy children.
Purim was compared to Yom Kippur, an ideal time for repentance. On Yom Kippur, one repents out of fear, whereas on Purim on repents out of love.
Rabbi Shneur Zalman of Liadi: "If the Jews had changed their religion, Haman would not have attacked them".
"The Encyclopedia of Hasidism" – Tzvi M. Rabinowicz