True sheep hear and follow the voice of the one who is leading them to Christ. This voice leads them by the Word of God to be the People of God. The Church follows the true shepherd because He leads them only to Christ. A strange voice they will not follow. God is at work in every believer. The Holy Spirit helps the believer to hear the true shepherds of God. Are you trusting in God to help you know who is a true shepherd and who is not?
Consider: 2 Timothy 1:13-14