There are many sounds we hear constantly, but when they become familiar we cease to heed them.
Many people say, ‘If God exists, why doesn’t He reveal Himself with a big, booming voice from Heaven?’
God purposely created us with volition. He is a Gentleman and will not coerce our free-will. While it’s true His voice can topple mountains (1 Kings 19:11-13), a big booming voice from Heaven would scare us all into submission.
God does not want us to worship Him because of fear but because of love. That is not to say He is always silent. He actually talks to us all the time in a whisper-still voice so as not to intrude on our free-will. We often call the ‘Voice of God’ our conscience. He speaks to us constantly, but we either tell Him to be quiet or, sadly, we have ceased to listen to Him altogether.
God speaks to us in so many ways: through Creation, through our conscience, through the Godly actions and words of others, and through the Bible. All of these means are non-evasive and require the use of our free-will to listen.
“So now, brethren, I commend you to God and to the word of His grace, which is able to build you up and give you an inheritance among all those who are sanctified.” Acts 20:32