Again, we differ Oscarr,...
Rom 8:12 So then, brethren, we are debtors, not to the flesh, to live after the flesh:
Rom 8:13 for if ye live after the flesh, ye must die; but if by the spirit ye mortify the deeds of the body, ye shall live.
Rom 8:14 For as many as are led by the Spirit of God, these are sons of God.
This is one of the goals in Christianity, to be a son of GOD, meaning, no longer a babe in Christ.
We are to follow Jesus, we are to be led by The Spirit of GOD,.... there is no mention of GOD only speaking from the bible, or of it being in between GOD and us.
That is quite the safe place to hide under Oscarr, but it is not how Jesus did things.
Jesus told the story about the rich man in hell pleading with Abraham to allow Lazarus to rise from the dead to go to his brothers to warn them not to come to the horrible place he was. Abraham told him that his brothers had the Law and the Prophets [ie: The Old Testament Scriptures] and if they didn't believe them, then they wouldn't believe even if someone rose from the dead.
We know (well, I think that most believers do), that Satan can counterfeit anything, and mimic the Holy Spirit, and even appear as a vision of Jesus or Mary to deceive people, possibly even the elect. So, how do we know that the voice in our heads is really the Holy Spirit? Without reference to the written Scriptures, we have no basis for knowing.
Satan can quite easily generate positive, peaceful feelings along with the voice, and give the right jargon and be so close to the genuine, that only one well-versed in the Scriptures and in constant fellowship with the Lord through prayer, is able to tell the difference. The devil is a master at lulling someone into a false sense of peace and security while feeding him codswallop guidance that will result in serious problems and even disaster for the person and those around him.
He can also send along very plausible looking religious people who walk the walk and talk the talk, to deceive people. All we have to do is to read John Bunyan's Pilgrims Progress to see how Christian was easily deceived by Mr Worldly Wiseman, and Mr Talkative who gave very believable and plausible opinions and guidance, and sometimes needed direct intervention to get him back on the right path again.
The reality is that things are not always what they appear to be, and Jesus said that our enemies are often those of our own household, ie: the ones we respect the most at home and at church. We see it in the mega-churches where a big-name preacher gives great claims of blessing, wealth, signs and wonders, and draws away tens of thousands of disciples to himself, and yet at the end of it it is all just words with no substance. Not everyone who says, "God has told me [this]" or "God has told me [that]" is actually hearing His voice. He could be hearing from another god, but not the God of the Bible.
John had very good reasons to say, "Believe not every spirit but test the spirits to see whether they are of God or not." He knew, like Paul (1 Corinthians 14) that every voice has significance in one way or another. But John knew that not every voice comes from God, and to accept voices, no matter how plausible they sound, or what peaceful and positive feelings that come with it, without testing what is said by the written Scripture, is foolish and dangerous. Listening to the wrong voice can make shipwreck of one's own soul and many others around the deceived person.