Have you ever heard a voice from Heaven? I guess not many people have, and how would you know that it was from Heaven and not from somewhere else? Once I did hear a voice, it was an electric sound that came into my right ear, I felt it as well as heard it. It gave me advice which I followed, and saved myself from a disaster. I have no idea what that voice was, I thought perhaps it was an angel. That was many years ago, and it was the one and only time it ever happened.
The other day I stumbled upon the following interesting information on the internet, which some of you may like to read. [If you have ever heard a voice from Heaven, please leave a comment, I'd love to hear about it]
BAS KOL - Ein Mashgichin B'vas Kol
One of the lower forms of prophecy is called Bas Kol [lit. echo], where certain individuals of a high spiritual status hear a heavenly voice. The Gemara in numerous places cites instances when a Bas Kol was heard, relaying information from Heaven to the earth. The Halachic ruling [Bava Metzia 59b] is that we do not accept the ruling of a Bas Kol when it contradicts the majority opinion of the Sages. [Some Tana'im ruled more stringently, asserting that we do not accept the testimony of a Bas Kol even if it follows the majority opinion. See Background to Yevamos 14:2:b.]
Source: Daf Yomi