you're suppose to take it in faith that they tell you the truth! I say again... LOL!
I don't know about all Christian religions, but I was raised in my early years as Evangelical/Charismatic. We were taught that Gods voice doesn't come to us through booming voice, or a burning bush anymore. The prophets of God are gone now; they have all been accounted for.
We were taught that the still, small voice you hear when you're very quiet, is God talking to you. And you are NOT suppose to be bragging about it, declaring the word of god, or any of the other blasphemous things these same people tell people today.
When I stopped my seeking of commonalities among ALL religions, I settled into Paganism. Not necessarily because I anthropomorphize Gods and Goddesses, i guess to an extent I'm still agnostic, though I've been Pagan for over 40+ years... BUT I came to recognize that "still small voice" inside me was my instinct... my gut instinct... that always picks up on cues, words, and signs that may be invisible to the eyes and ears. Our mind constantly processes all this information we don't realize we're taking in... and inside ourselves, we know what's right and moral for ourselves and those around us.
I don't know if its biblical or not... but the "Lord helps those who help themselves" made more sense to me than anything else I remember from my "churchy" days. Gods, thank goodness they're over. I'll take common sense with a solemn space of ritual for individual comfort, and a madcap feast afterwards anyday!