Uziyahu and Hashem

In Perek Vuv it says that Man is mortal and Hashem is imortal. Uziyahu tried to go against Hashem but he was punished. From this I think I can learn that no matter how much you think you know everything  Hashem knows everything and is all powerful.The people back then didnt think they were going to get punished. Today I think people are very confident in themselves and dont think that they will get punished.