For his Spirit joins with our spirit to affirm that we are God’s children. Romans 8:16
How does God speak to us? Can He speak to someone who hasn't received Him?
Do you remember as a child attaching a long string to 2 tin cans and using it as a telephone to your buddy?
Our connection to God is a Spirit to spirit one. The string that connects us to God is his Spirit living in us. He cannot speak to our flesh or our reason - they dont have God in them. But our spirit is indwelled with God's spirit when we commit to communion with Him - receiving Him into our life.
Our flesh and reason is under our command - we have the power through Christ to make them obey and come into line. But our spirit is the temple where God speaks. If we aren't in tune with our spirit, we won't be listening for his voice. We must find Him where He is and then listen.
Can you hear Him? Tighten up that string.