First, what is that word? Is it just the words in the book we now call the Bible? It can't be that, because Hebrews was written before that book called the Bible was finished. So what is that word? John 1:1 word for Word? The Word? Jesus?
In which case faith and hearing come through Jesus, not pages in a book, or things that come out of our mouth on a good day.
Second, If isn't always a choice. I was my husband's decision maker when he was heavily sedated in the ICU. I was the one who gave approval for his procedures, operations, and everything else they wanted to do for him. And yet, here are the Ifs I kept hearing.
"If he survives," "If he makes it through the night, "If the white blood cell count goes down," "If his kidneys start working again," "If he makes it through the night," "If he stabilizes," "If an abscess from his teeth dislodges and travels to his heart," "If he can breathe when we take the ventilator out," "If he can breathes for more than an hour, two hours, six hours, 18 hours," and the Ifs kept coming.
There are Ifs with choice. There are more Ifs without choice. And, quite frankly, God is sovereign over all Ifs.
Someone Iffed God in the Bible. Satan. "If Job..." And sure enough, God granted his Ifs with one condition.
Third, Jesus did say who would and who wouldn't call upon the Lord in John 3:16-21. Cut down to the chase, none of us would unless the Father wroughts/carries out. We made our choice. Our choice was to hide in the darkness to keep our sins. That is everyone's choice, until the Father wroughts!