True faith is not only a knowledge and conviction that everything God reveals in His Word is true. It is also a deep-rooted assurance, created in me by the Holy Spirit through the gospel, that, out of sheer grace earned for us by Christ, not only others, but I too, have had my sins forgiven, have been made forever right with God, and have been granted salvation.  (see Heidelberg Catechism Q&A 21)