Just because you can hear God's voice does not mean you love Him or even like Him very much. It just means you're a sheep. Some sheep do not love their Shepherd and choose to follow other Shepherds  (called pastors). You see, the second part of the verse is more important than the first - "the sheep follow Him : for they know His voice. AND A STRANGER THEY WILL NOT FOLLOW". "My sheep hear My voice, and I know them, and they follow ME".

If you are a Prophet, you can impress people with your gift, especially those who do not hear from God themselves.  They will adore you and highly esteem you (or stone you lol), believing you are a man or woman of God - because you prophecy accurately - but where is your heart? Do you love Him or just His gifts? Are you like the bride who received her wedding dowry than ran off with it, leaving the groom alone at the altar?