Green, I think you're over thinking this. When I buy a book, I don't think I need to consult God about it. He's given me a brain and discernment. Also, by 'voice' I mean the personality/character of the author and how it shines through (or bottoms out) in the writing. For example, C.S. Lewis has a different voice to Stephen King and King and Neil Gaiman but all are men who write fantasy fiction.
OK, tin-tin. That's how you view things. I, personally, try to, anyway, consult God, who lives and breathes inside me, for everything I do, and, picking out a book or, of course, He really talks to me when He PUTS a girl I think attractive in a certain place, like, for example, a bookstore
And, yeah, I think He wants us to talk back, and, talking is of the unseen variety, as I believe, it's of no words, no voice, just a doing action of faith, which, we know from Scripture is the only POSSIBLE way to 'please God.' Notice, I didn't say, 'Without belief, it's impossible to please God,' because that's something entirely different than having faith.
We can believe a girl in a bookstore is right for us if we were to go up to her, but, without faith, we will not 'see' she is right for us, or not. God will test our faith in many ways, and, certainly, in this human life we live, rejection is part of that scope of reality, too. But, if we focus on Him and try, through faith in His leading, to understand His targets out there for us are for us to HIT then we will not MISS God's best life now for us.
The Lord leads
God bless ya, aussie mate