Reciprocating Hashem's Love
The great tzaddik Rabbi Zusha of Anipoli once heard one of the maggidim delivering mussar to a crowd and noticed that the audience were not receptive to the words of the Maggid. R' Zusha himself then began addressing the crowd, awakening them to teshuvah causing the people to cry tears of regret. R' Zusha explained that the first speaker expounded upon the frightful retribution that awaits those who do not do teshuvah, giving them strict mussar whilst trying to awaken in them יִרְאַת הֶענֶשׁ the fear of punishment; these harsh words sealed their hearts towards his message.
R' Zusha, on the other hand, spoke about the great love of Hashem towards His children Only after elaborating on this deep connection, he raised the question, "How is it possible to do something contrary to the will of The One Who loves us so infinitely?" When the crowd heard this, it awakened within them great grief for all the sins they had committed, and they began to weep copiously.
Many tzaddikim have taught about the great love of Hakadosh Baruch Hu for His children: Even if we were to combine all the love that exists in the world, we would never reach the unfathomable amount of love that Hashem has for even the 'lowliest' Yid. However much we believe in Hashem's fondness for us, we still do not begin to grasp the boundless, endless, infinite love of Hashem for every single Yid.
The Zohar Hakadosh describes that if people would really fathom Hashem's infinite love for Yisrael חֲווּ שׁאֲגִין כִּכְפִירַיָא וּמְרַדְפִין אַבַּתְרֵהּ they would scream like young lion cubs and race towards Him. If one would sense this boundless love, he would constantly pursue closeness with Hashem with all his might.
(זוה"ק פרשת שמות ה:)