Musar for Berakhot 34:19

Therefore, you must know that there are none so cruel as those who commit transgressions, for through the sin of hatred for no good reason the Second Temple was destroyed and all manners of troubles come upon the world because of sins, as our Rabbis, upon them is peace, stated: "Because of the sin of failure to give Hallah there is no blessing in the harvest" (Shabbath 32b). And, "Because of the sin of failure to give Terumah and Tithes the Heavens withhold their blessing" (Ibid). And, "For the sin of twisting, falsifying and degrading the law the sword, great plunder, plague and drought come" (Ibid.: 33a), and there are many similar instances. And in truth those who cause these troubles are the really cruel ones against themselves, their children and the people of their generation, as it is said that all the people were sustained through the merit of Hanina ben Dosa (Berakoth 17b).