Tosefta su Isaia 43:63

Similar to this [it says]: “Do not remember what happened in the past…” (Isaiah 43:18-19) “Do not remember what happened in the past:” this is [referring to] the burden of the kingdoms [of Persia, Greece and Rome]. “… and do not think about what happened in the days of old:” this is [referring to] the burden of Egypt. “Behold, I am going to do something new, now it will spring forward. Don’t you know about it?” this is [referring to] the war of Gog. They (i.e. the Rabbis) have said a parable to what this is similar to. [This is similar] to a person who came upon a wolf and was saved from him. Then he was telling [everybody about] the incident with the wolf. Then he came upon a lion and was saved from him. He forgot the incident with the wolf and was telling [everybody about] the incident with the lion. Then he came upon a snake and was saved from it. He forgot the incidents of both of them (i.e. the wolf and the lion) and was telling [everybody about] the incident with the snake. So to the Jewish People, the recent troubles make them forget about previous [troubles]....