The purpose of Once Lost is to encourage those that were (once lost) in their sin to reach out with the saving message of the Gospel to those that still are.

"For we ourselves also were sometimes foolish, disobedient, deceived, serving divers lusts and pleasures, living in malice and envy, hateful, and hating one another."  Titus 3:3

In 1 Corinthians 9.22, the Holy Spirit through Paul told us, "To the weak became I as weak, that I might gain the weak: I am made all things to all men, that I might by all means save some." We want to encourage the Christian to reach out to the lost with the saving Gospel message of Jesus Christ. It was a direct command from Christ to all believers to share the truth of who He was and the reality of our position to Him. Christ said in Luke 19:10 "For the Son of man is come to seek and to save that which was lost."