yeah, it's quite an interesting thing... the voice...

you kinda have to persist with it and expect a response and eventually sometimes you get something that you don't expect, and that surprise is the signal that it has possible external origin

anyone who sells you the idea that they have mastered it should be treated with suspicion, i think my personal theory on it is that you only listen to the voice of God first hand, which means you have to actually try to hear it

the Bible also makes reference to this in places as the "still small voice" and this ties together with the instruction to pray out loud, and where this is advised also in some places it talks about the importance of privacy, and hinting at the idea that public praying as theatre is not a good thing, per se