Musar zu Dewarim 7:26

Our Rabbis said: "Every man who is impudent or proud of spirit it is as though he were an idolator" (Sotah 4b), for it is written, "Every one that is proud in heart is an abomination to the Lord" (Prov. 16:5) and it is written there: "You must not bring an abhorrent thing (idol) into your house …" (Deut. 7:26). And there are those who say it is as though he violated all the laws against sexual license, for it is written: "For all these abominations were done by the people who were in the land before you and the land became defiled …" (Lev. 18:27). And there are those who say, "It is as though he built a place for idolatry." And they said in Sotah 5a, "Every man who is arrogant of spirit becomes less in the end as it is said: 'They are exalted for a little while' (Job 24:25). And such a one is deserving to be hewn down like a grove planted for idol worship, as it is said: 'And the high ones of stature shall be hewn down' (Is. 10:33). And his dust shall not awaken and the Spirit of God laments over him. The Holy One Blessed be He, said, 'I and he cannot live in the same world,' as it is said: 'Whoso is haughty of eye and proud of heart, him will I not suffer'" (Ps. 101:5).

Rabbi Shimon ben Yochai in Sotah 4b compares an arrogant person to an idol worshiper. This exegesis is based on the Torah applying the word "abomination" to both of these types of individual. Rabbi Yehudah castigates haughtiness as being the equivalent of heresy of the first order. He quotes a verse from our portion. It is written: ורם לבבך ושכחת את ה' אלוקיך "When you become haughty you forget the Lord your G–d." Different sages in the Talmud heap more scorn on arrogant people, each one supplying scriptural proof. The common denominator for this universal condemnation of the haughty person is that, inasmuch as G–d is our Master and we are His servants, how could a servant arrogate to himself importance in the presence of his master?