Variantly: "The rock of your birth you have forgotten": You have forgotten the acts of your forefathers, viz. (Isaiah 51:1-2) "Look to the rock from which you were hewn and to the hollow of the pit from which you were dug. Look to Abraham your forefather and to Sarah who bore you."
Variantly: "You have weakened the Rock of your birth": Whenever I sought to confer good upon you, you "weakened the celestial power" (i.e., Me): You stood at the Red Sea and said (Shemoth 15:2) "This is my G-d and I will extol Him," and I sought to confer good upon you, when you turned around and said (Ibid. 17:3) "Why did You bring us up from Egypt, etc." You stood at Sinai and said (Ibid. 29:7) "All that the L-rd spoke we will do and we will hear," and I sought to confer good upon you, when you turned around and said of the golden calf (Ibid. 32:4) "These are your gods, O Israel" — Whenever I sought to confer good upon you, you "weakened the celestial power." (Devarim, Ibid.) "And you forgot the G-d mecholalecha":