מדרש אויף תהילים 138:1

"I will thank you, O Lord, with all my heart..." (Psalm 138:1) Isaiah said: "Grass withers and flowers fade, but the word of our God endures forever." (Isaiah 40:8) And what do you have to do on the high mountain? Go up and proclaim the good news to Zion. Israel said: "We are afraid because of our enemies." The Lord said: "Your enemies were but grass. As long as they existed, you were afraid of them. But now that they are gone, lift up your voice and do not be afraid." Israel said: "When will we be able to avenge ourselves against the wicked?" As it is said: "As you have done, it will be done to you; your deeds will return upon your own head." (Obadiah 1:15) What was the punishment for smashing the children of Israel against the rock? As it is said: "Happy is the one who seizes your infants and dashes them against the rocks." (Psalm 137:9) At that time, Israel cursed the Lord with all their heart. As it is said: "I will thank you with all my heart." From this we learn that as long as the wicked are in the world and oppress Israel, pushing them around and not allowing them to curse with all their heart, if they are destroyed at that moment, "I will thank you with all my heart."...

Another thing, I will sing against gods. Against the Sanhedrin. As it is said (Exodus 22:27), "You shall not revile God." Against the prophets who were called gods. As it is said (1 Chronicles 23:14), "And Moses, the man of God." (1 Samuel 2:27) "And there came a man of God to Eli." Even in their deaths they were called gods. For you can find in Samuel (2 Samuel 23:13), "I saw gods ascending out of the earth." Therefore, we say, "I will sing against gods." Against the troubles that come upon us, we sing to You. I will prostrate myself toward Your holy temple and give thanks to Your name. And it also says (Zephaniah 3:16) "In that day, it shall be said to Jerusalem, Fear not." Thus, when the wicked are destroyed from the world, Israel will praise the Lord, saying, "When the temple is rebuilt and Your sanctuary restored, at that time I will prostrate myself toward Your holy temple." Why? Because You have magnified Your word above all Your name. Israel said to the Lord, "You have magnified everything that You have spoken to us through the prophets." And what have I said? (Joel 3:1) "And it shall come to pass afterward, that I will pour out my spirit." (Joel 4:18) "And it shall come to pass in that day that the mountains shall drop down new wine." And it also says (Isaiah 51:6) "Fear not the reproach of men." Why? Because the Lord has magnified to do. And it is written (Psalm 126:2), "Then was our mouth filled with laughter."