In Genesis 8 the verse states and they heard the voice of the lord walking in the garden in the cool of the day. I don't think that God has a problem talking. The bible does state several times through out the bible that God does talk. The problem is that we don't always listen. I am guilty of this myself. Sometimes life gets so busy that I don't have time to just sit in a quiet place and listen to God. In my spiritual life I am learning to distinguish the difference between what I want to here and what God wants me to here. Practice makes perfect. I definitely here from God and know that it is him because his ways are not our ways. When God speaks to me I know that it is him because the answer to any question that I ask is never what I would think of. It is true when the bible says that his ways are not our ways. God thinks above us. It is when we try to bring God down to our level we mess up. Thank God that he knows the heart or else we would be in big trouble.