The Maharal says that through Nachum Ish Gam Zu’s saying “Gam Zu L'tovah”, the extreme bad becomes the extreme good. So despite all the pain in Yaakov Avinu’s life, he didn’t really care that much, because he knew that saying Gam Zu L'tovah creates the opposite. So when Yaakov said to Paroh that he had a hard life, it didn’t really bother him. For good reason he said: יֶש לִי כֹל (I have EVERYTHING).
When Rivka said: מוצְתִי בְחַיַּי מִפְּנֵּי בְּנוֹת חֵּת “I am disgusted with my life because of the women of Cheis”, the letter: ף" "קוּ was small. And when it says: וְלִבְ כַ ף" כַ ף" was small. True, these people had evil and misfortune in their lives. But deep down, they were total Simcha, since: כָל מַאי דְ עָבֵּיד רַחְמָנָא לְטַב עָבֵּיד Whatever Hashem does, is surely best. R' Chatzkel Levenstein Zatzal points out how Yaakov Avinu didn’t really get excited when he discovered: “וְהִנֵּה הִ יא לֵּאָה” that he married the wrong woman. The cruelest practical joke of the universe didn’t faze him despite his unending love for Rochel L'shem Shamayim.
