When Jesus had spoken these words, he lifted up his eyes to heaven, and said, “Father, the hour has come; glorify your Son that the Son may glorify you, since you have given him authority over all flesh, to give eternal life to all whom you have given him. And this is eternal life, that they know you, the only true God, and Jesus Christ whom you have sent.
John 17:1-3 (ESV)
Faith alone is the key to forgiveness and salvation. We all know and feel our guilt and brokenness before a holy God. Jesus Christ alone must be the object of our faith that brings justification and peace with God. Faith is a gift of the Holy Spirit, not a feeling. It can be increased through prayer and the study scripture. Faith is not a work, but spurs us on to good works as we serve as the representatives of Christ.