We know that Hashem’s name אלה-ים is associated with Middas Hadin, strict judgement. Now, אלה-ים has a gematria of 86. R' Tzvi Hirsch of Zidichov explains that the way to “sweeten” or diminish and weaken the force of judgement is with the pasuk טוב ה', Hashem is good.
The gematria of טוב ה' (טוב י-ה -ו-ה) is 43. This is half of 86, which is symbolic of splitting the din in half.
Now, the longest pasuk in Tanach, found in Megilas Esther, reads: ויקראו ספרי המלך בעת ההיא בחדש השלישי הוא חדש סיון בשלושה ועשרים בו ויכתב ככל אשר צוה מרדכי אל היהודים ואל האחשדרפנים והפחות ושרי המדינות אשר מהדו ועד כוש שבע ועשרים ומאה מדינה מדינה ומדינה ככתבה ועם ועם כלשנו ואל היהודים ככתבם וכלשונם, so they summoned the king’s scribes at that time, in the third month, which is the month of Sivan, on its twenty-third day, and it was written as Mordechai had dictated to the Jews and to the satraps, the governors and officials of the provinces from Hodu to Kush, 127 provinces, to each province in its own script, and each people in its own language, and to the Jews in their own script and language. This pasuk contains 43 words! And what does it discuss? A matter that is good for the Jews (טוב ה'), as it speaks with the reversal of the decree of Haman and Achashveirosh!
With this we can explain the secret contained in the name נחום איש גם זו, whose name comes from his response to adversity: גם זו לטובה, this too is for the good. Noting that the word גם has a gematria of 43, we can understand it as גם, which can weaken the force of judgement (as we mentioned earlier), and helps us recognize that its זו לטובה, all for the good.
