'Hear' in the Bible

For it is not those who hear the law who are righteous before God, but those who do the law will be declared righteous.

How are they to call on one they have not believed in? And how are they to believe in one they have not heard of? And how are they to hear without someone preaching to them?

as it is written, "God gave them a spirit of stupor, eyes that would not see and ears that would not hear, to this very day."