I was just wondering this question. I've been really yearning to hear God's voice and I'm thinking that I'm just not special enough. I believe wholeheartedly that He's real (I don't even think about it anymore or doubt it) but I guess in the back of my mind that would sort of be proof of it besides just being really, really cool. So maybe that's why He doesn't audibly speak to me as He already knows that I'm just looking for confirmation that I don't need since I have my faith.