Jesus' last charge to His followers after His resurrection and before His ascension to Heaven was to take their life-changing faith in Jesus to the world (Matt. 28:19). We can do this in a number of ways such as modeling the Christian life for others, sharing our own story of faith, ministering with the gifts of the Spirit (1 Cor. 12), serving them, or anything else that shows people that God loves them deeply and wants them to know Him personally.
Don't keep your faith limited to your car and your church. Take it outside and let the world know what a changed life looks like. Let them know how and why you have a life and peace that goes beyond natural understanding (Phil. 4:6-7)!