Hearing His voice is a two-way conversation. The condition of our heart affects our hearing when conversing with God. Romans 10:17 says, "So then faith cometh by hearing, and hearing by the word of God." He also speaks to us through other people, dreams, or other ways. We need to be aware of His voice when He speaks. Hear with your heart and your spiritual ears. His voice is in the Bible, it is the Bible. Some are dull of hearing. II Timothy 4:3, "For the time will come when they will not endure sound doctrine; but after their own lusts shall they heap to themselves teachers, having itching ears." To hear our God's voice we need to have a relationship with Him. God wants that relationship, a prayer life determines our life. Wait for the answer. Wait with your spiritual heart and ears.