Rom. 10:9-10 For if you confess with your mouth that Jesus is Lord and believe in your heart that God raised him from the dead, you will be saved. For it is by believing in your heart that you are made right with God, and it is by confessing with your mouth that you are saved.
Here is the Gospel message in a nutshell. We can have a personal relationship with God through Jesus. It's not very hard at all. It involves opening up our heart to believe in who Jesus is and what He did for us at Calvary. It involves declaring our faith in Him and confessing our sins to Him so He can make our hearts right with God.
We must know that Jesus is Lord of life, that is, that He is the supreme ruler over all things. We must know that He is the one who took upon himself the condemnation for our sins. We must know that His death on the cross makes it possible for us to have our sins forgiven and forever forgotten.
Declaring that it is true is not quite enough though. We must believe in our hearts that it is true. It means that we commit ourselves to this wondrous, marvelous truth. Jesus died on the cross for our sins and God raised Him from the dead and brought Him back to heaven from whence He came. When we truly believe in what Jesus did for us we are then saved. It means that we believe in Him and forsake our sins. It means that we let Him redirect our lives so that now we live for Him and not for ourselves or anything or anyone else