"Therefore, having been justified by faith, we have peace with God through our Lord Jesus Christ, through whom also we have access by faith into this grace in which we stand, and rejoice in hope of the glory of God." - Romans 5:1-2 NKJV
Faith, in its simplest definition, is simply believing what God has said. This is how we receive salvation, by believing the gospel that Christ died as our substitue and rose from the dead for our justification. As we step into this new life, we don't discared our faith, our believing what God said. We continue, then, to shape our lives around all that God has said to us in His word. We also employ our faith as was stated above in Romans 5 to access this grace. An acronym I once heard for grace was God's Riches At Christ's Expenese. This same faith that saves us gives us access, admission into all of God's Riches!!