What is the difference in hearing a autable voice from God and hearing Gods voice in Gods word. Or God planting a conviction in your heart?
No one would write about the latter.
2nd Timothy Chapter 3 verses 16 & 17,
All scripture is given by inspiration of God, and is profitable for doctrine, for reproof, for correction, for instruction in righteousness.
Here's the point. The story of John the Baptist, baptizing Christ and God speaking does not mean that Gods words were audible to anyone.
Not one man on this planet knows one way, or the other.
Does it matter?