Contradiction with Proverbs 14:12
Amos 6:2 talks about self-assuredness and notable cities, whereas Proverbs 14:12 highlights the deceptive nature of a man's perceived right way leading to death.
Proverbs 14:12: There is a way which seemeth right unto a man, but the end thereof [are] the ways of death.
Contradiction with James 4:6
Amos 6:2 illustrates the pride of the Israelites in their cities, contrasting James 4:6 which states that God resists the proud but gives grace to the humble.
James 4:6: But he giveth more grace. Wherefore he saith, God resisteth the proud, but giveth grace unto the humble.
Contradiction with Isaiah 2:12
Amos 6:2 mentions confidence in one's status or city, while Isaiah 2:12 warns of the Lord's day against the proud and lofty.
Isaiah 2:12: For the day of the LORD of hosts [shall be] upon every [one that is] proud and lofty, and upon every [one that is] lifted up; and he shall be brought low:
Contradiction with Jeremiah 9:23-24
While Amos 6:2 describes cities perceived as great, Jeremiah warns against glorying in wisdom, might, or riches, emphasizing understanding and knowing God instead.
Jeremiah 9:23-24: Thus saith the LORD, Let not the wise [man] glory in his wisdom, neither let the mighty [man] glory in his might, let not the rich [man] glory in his riches:
Contradiction with Obadiah 1:3-4
The self-exaltation seen in Amos 6:2 contrasts with Obadiah's warning that even if Edom elevates itself, God will bring it down.
Obadiah 1:3-4: The pride of thine heart hath deceived thee, thou that dwellest in the clefts of the rock, whose habitation [is] high; that saith in his heart, Who shall bring me down to the ground?
Contradiction with Matthew 23:12
Amos 6:2 suggests self-confidence in cities' greatness, contrasting the teaching in Matthew that whoever exalts himself will be humbled.
Matthew 23:12: And whosoever shall exalt himself shall be abased; and he that shall humble himself shall be exalted.