The Pain of Am Yisrael Is Hard for Hashem
Hashem treats Am Yisrael as His Own Flesh, kivyachol. They are the mate of Hakadosh Baruch Hu, and he calls them His daughter, His sister, and His mother.... There is a real closeness between them, and they are His sons, and she’eiris nachalaso – the remainder of His portion – meaning they are like His relatives and His portion. “How could I punish them,” He says, “for the pain will then be My pain!” as it says, “In all their pain, He has pain” – the Hebrew word “lo” is spelled with an aleph, to show that their pain reaches the peleh ha’elyon, the highest spheres above; and the word is read with a vav, meaning that it is difficult for Hashem to bear their pain and embarrassment, for they are His portion.
(as explained in Tomer Devorah, Chapter 1, the fourth middah)
Hashem Is Close to One Who Brings His Family and Acquaintances Close
When a person brings his family, neighbors and friends close [to Hashem], then Hashem is close to him as well. Just as he brings close those who “belong” to him, Hashem is also close to him...
(as explained in Chiddushei Aggados Maharal, Yevamos 62)
Like Family Members
The people of Am Yisrael are close to Hashem in essence, and they are connected to Hashem by nature, as family members are connected to each other. And therefore, the worst of Am Yisrael, who have no da’as at all, have the strength to sacrifice themselves al kiddush Hashem, for this is ingrained in the essence of their souls, which are connected to Hashem with a love concealed within them.
(as explained in Kol Simchah – Peshischa, Likutim)
