Ephesians 3:12

In whom we have boldness and access with confidence through faith in Him.

Children have boldness and confidence with their parents because they are in the family.  When we are born again, we join God’s family, and God is our Father.  Our boldness grows to approach God as our faith grows.  The bible is the way we access these promises and learn all that our Father wants us to have.  We need to build our faith to boldness just as a child to a parent.