Musar para sa Isaias 1:2

Mourning - Mourning over the destruction of the Beit Hamikdash [the Temple] is something that depends on action, and especially during the period of the Three Weeks, by day and night [one should] place ashes on the place where the Tefillin are laid, sit beside the Mezuzah, and recite the order of the Tikkun Chatzot. In truth, the action is not the core [of mourning], rather one must have an eye that weeps bitterly and a broken and crushed heart — like one mourning for his mother, gloomy, he should sigh with “brokenness of the loins” [i.e. being crushed by grief] over the sorrow of Heaven. And all is proportional to one’s knowledge, greatness of love [of Heaven], and the reward of his soul. And see the truth is that we are greatly diminished, and there is no one among us who knows what we are lacking, what we have lost, what we have caused through our many sins, what the exile of the Shekhinah is like, and [the extent of] the suffering of the upper and lower beings. Over this, all who are sorrowful should grieve, [but] in any case every man isn’t obligated except according to his [own] capacity. And he should imagine as though his mother were girded with sackcloth, wearing black [garments] and wrapping herself in black [garments], crying out bitterly — a voice heard in Ramah [on high, but see Jeremiah 31:15 snd other verses] — moaning like a dove. What does the language say? (Sanhedrin 46a): “I am distressed about my head, I am distressed about my arm”. “I have reared and brought up children, and they have rebelled against me” (Isaiah 1:2). And like this and that the living should take to heart things that embitter the heart. He should pour out his soul with a wailing voice; perhaps he will merit to see the consolation of Zion and the rebuilding of our Temple and our glory, that it be speedily rebuilt in our days, Amen.