Musar su Deuteronomio 8:14

And pride causes several transgressions and amplifies the impulse of a man's heart against him, as it is stated (Deuteronomy 8:14), "And your heart grow haughty and you forget the Lord your God." And it is [also] stated (Proverbs 21:4), "Haughty looks, a proud heart - the tillage of the evildoers' sin." Its explanation is: Pride is the tillage of evildoers, for the sins grow from it; as it was stated, "And your heart grow haughty and you forget." And it is [also] stated (Psalms 10:2), "The wicked in his arrogance hounds the lowly." And it is [further] stated (Psalms 31:19), "that speak haughtily against the righteous with arrogance." And it is [also] stated (Ezekiel 32:24), "who struck terror in the land of the living." And just like people make a tillage in the field in order to plant seeds and to harvest much produce, so do the evildoers make pride into a tillage in their hearts, and seed it with their evil thoughts to produce and to grow sins. Metaphorically speaking, these are the fruit of their thoughts - like the prophet stated (Hosea 10:4), "this judgment springs up like poison weeds, etc." And the explanation of "sin" (above in Proverbs 21:4) is, the tillage of the evildoers is the tillage of sin. And all [mention of] sin is [actually] plural, like (in Jeremiah 17:1), "The sin of Judah." Or (alternatively), its explanation is "and sin," like in (Habakkuk 3:11), "Sun, moon" (which means, sun and moon). And the understanding is - beyond [the fact] that pride causes sins, the trait itself is a sin, as it is stated (Proverbs 16:5), "Every haughty person is an abomination to the Lord." And a proud person will be given over to his impulse; for God does not help him, since he is "an abomination to the Lord."

Chapter 9 - How a person can accustom himself with the trait of kingship (malkhut): To lower himself - that his heart not become haughty, he [should] first of all always make himself like a poor person in front of his Maker, like an indigent requesting and begging. To accustom himself to this trait - even if he is rich - he [should] think that there is not a thing that is attached to him from all that he has; and he [is] forsaken and always needs the mercy of the Creator, since he has nothing besides the bread that he eats. And he [should] subdue his heart and afflict himself. And even more so at the time of his prayers, as it is a wonderful device. And [about] the opposite of this is it stated (Deuteronomy 8:14), "And your heart will rise and you will forget" - as external forgetfulness is found there. And David supplicated with this trait much, as he stated (Psalms 25:16), "for I am alone and poor." As behold, each and every one of the people of his household needs to help himself - what are they [then] to him? And even his wife and children, what will they help him when he is judged in front of the Creator or at the time that his soul is withdrawn? Will they accompany him any [further] than to his grave? What are they for him at the time of his judgments from the opening of the grave and beyond? Hence, he [should] lower and refine himself with the secret of this trait.

On arrogance, scripture explicitly warns saying: "then your heart will grow haughty, and you will forget the L-rd, your G-d" (Devarim 8:14).