Musar על סוכה 58:8

He should also reflect upon the severity of this sin, a negative commandment among the 613 mitzvoth, as it is written (Devarim 8:14): "And your heart will swell [with pride] and you will forget the L-rd your G-d," as listed in Semag. And Chazal have said (Sotah 4b): "One who is haughty of heart is like a server of idols." And the more one thinks to magnify his name in the world, the more it is diminished and his body is spurned by the creations. He should also reflect upon the greatness of his punishment in this world and in the world to come, as they said (Succah 29b): "Because of four things the possessions of householders go to waste … and haughtiness of heart." And they also say (Sotah 5a): "All who have haughtiness of heart are in the end deflated." And we also learn there: R. Chisda said: "Whoever has haughtiness of heart — the Holy One Blessed be He says of him: 'He and I cannot inhabit the [same] world.'" And R. Elazar said: "If one has haughtiness of heart, his dust does not stir for the resurrection." And this is measure for measure. For instead of reflecting always that he is destined for a pace of dust, maggot, and work, to still his pride, he did not think thus, but only that the heights of the rocks would be his domain forever and that the spacious heights would be his eternal rest, above all of his contemporaries. Therefore, when his body turns to dust, his dust lacks the power to stir from its place, and all will arise and stand on their feet, and he will remain lying low, beneath the soles of the feet of all the people whom he vaunted himself over while yet in life. And he is also abominated because of this in the eyes of the Blessed L-rd, as it is written (Mishlei 16:5): "The abomination of the L-rd are all the haughty of heart."