Midrash su Isaia 54:10

(Pr. 30, 15) The leech hath two daughters crying, Give, give. Said R. Chisda in the name of Mar Ukba: "This refers to heresy and the government, which are never satisfied, the first of catching men to her belief, and the second, duties." R. Chisda in the name of Mar Ukba said further: "The Gehenna cries, saying, 'Bring me in the two daughters, who always cry in this world, Bring in to me, bring in to me.' It reads (Pr. 2, 19) All that come unto her return not again, and they will not reach the paths of life. If they do not return again, they will certainly not reach the paths of life? It means, therefore, that they who repent and return from heresy, die that they may not return to heresy again." Does not the same apply to other sins? Are we not taught in a Baraitha: It was said of Elazar b. Durdia who left not out one prostitute. He was once informed that there was a prostitute in one of the sea countries, who received a pocketful of dinars in reward, and he took this amount and passed seven rivers until he reached her. She, however, caused him to repent. He then placed himself between two mountains, saying: "O ye mountains, pray for me," to which they answered: "Instead of praying for thee, we must pray for ourselves, for it is said (Is. 54, 10) For the mountain may depart, and the hills may be removed." He then said: "Heaven and earth, pray for me," and they also answered: "We have to pray for ourselves, as it is said, (Ib. 51, 6) For the heavens shall vanish." He then said: "The sun and moon pray for me!" Whereupon they replied: "We have to pray for ourselves, as it is said (Ib. 24, 23) Then the moon shall be confounded and the sun ashamed." He then said: "Stars and planets, pray for me." Whereupon they replied: "Before we do it for you, let us rather pray for ourselves, for it is said (Ib. 34, 4) And all the host of heaven shall be dissolved." He then exclaimed: "I see that I can rely upon myself," and having put his head between his knees, he wept until his soul departed. A heavenly voice was then heard, saying, "R. Elazar b. Durdia is prepared for life in the world to come." (Hence we see that he who has repented from sin, also died? Because he, Elazar was involved in such, it is similar to heresy.) Rabbi, when he heard this, wept, saying: "There is again one who bought his world in one moment while another must work for it all his life." And again, it is not enough for those who repent, that they get a share in the world to come, but they are named also rabbis [as the heavenly voice said, Rabbi Elazar].

Israel spake before the Holy One, blessed be He: Sovereign of the worlds! Thou didst complete the heavens and the earth with reference to being made, created, and called into existence; let not Thy mercy and loving-kindness be withheld, for if Thou withholdest Thy mercy and loving-kindness we are unable to exist, because the world rests upon Thy mercy and loving-kindness, as it is said, "For the mountains shall depart, and the hills be removed; but my kindness shall not depart from thee… saith the Lord that hath mercy on thee" (Isa. 54:10); and it says (elsewhere), "Remember, O Lord, thy tender mercies and thy loving-kindnesses; for they have been ever of old" (Ps. 25:6).