Hasidut untuk Yesaya 12:5

For He has triumphed gloriously. One should say, "Even though He has triumphed gloriously." As Rashi said, "however much I may praise Him there will still remain something additional in Him to be praised," as it is written (Exod. 15:11), "awesome of praises [t'hilot]." And this was their uncertainty, whether to sing, as Rashi said, "it entered his mind to sing, and he actually did so." This is similar to what I heard from my grandfather, z"l, regarding King Hizkiyah, who, because he failed to respond with song to the downfall of San'heriv, he was not made the Messiah -- he said that His Kingdom, may He be blessed, was apparent, such that they did not have to take any action regarding the miracle. And thus it says in Shir HaShirim Rabbah (4:8:3), "This has already been made known" (Isa. 12:5); see there on verse 4:8. However, in truth, one must rouse oneself and sing the song, so that the joy and the love overcome the fear, and this is what is added (Exod. 14:31): "The people feared, etc.," and nevertheless, "they believed" and they responded to the miracle and sang a song before Him. And the Israelites had to establish this clearly, that, while "He has triumphed gloriously," He is nevertheless close to His People, and [they had] to refute the evil ones who say that God does not concern Himself with what happens in the world.