This is a nice meme, since both speak to us via our psyche, it is very hard to tell them apart by a Voice alone, trying to judge the emotional response of what we are hearing is also a nice first step, <-- is not much different than the open door/closed door of trying to determine God's Will. (you have a 50/50 chance of being right) There is NO substitute for time spent daily trying to be led by God's Spirit. IF you don't know God's Written Word like the back of your hand then you are much easier to decieve using bad satanic words.

3rd voice that a Christian learning how to follow the Spirit is your own emotions "man's heart is exceedingly wicked and desperately sick"

When you start out, you will get bad words and make mistakes, The once thing that never varies is God's Love and Faithfulness.

Trust God, Trust Jesus, Trust the Holy Spirit. All these words are just basic road signs pointing you in the general direction. God will use his Spirit to Teach and Perfect if you stay faithful to His Word