Contradiction with Proverbs 28:9
Proverbs 28:9 says that if someone turns away their ear from hearing the law, even their prayer is an abomination, which contrasts with Jeremiah 6:18's call to listen.
Proverbs 28:9: He that turneth away his ear from hearing the law, even his prayer [shall be] abomination.
Contradiction with Matthew 13:15
This verse notes that people’s hearts have grown gross, which contradicts the open call to witness in Jeremiah 6:18 as people consciously ignore it.
Matthew 13:15: For this people's heart is waxed gross, and [their] ears are dull of hearing, and their eyes they have closed; lest at any time they should see with [their] eyes, and hear with [their] ears, and should understand with [their] heart, and should be converted, and I should heal them.
Contradiction with Isaiah 42:20
In Isaiah 42:20, it is said they see and hear but do not heed, contradicting the attentive hearing sought in Jeremiah 6:18.
Isaiah 42:20: Seeing many things, but thou observest not; opening the ears, but he heareth not.