Verses 1-10 of Luke 17 serve as a warning of being a stumbling block of discouraging faith in the little ones Christians that trust in Jesus. The important thing about faith is the Object of your faith; faith lays hold of God who does impossible things! Ed shows from the healing of the ten lepers that the one who returned emphasizes the heart obedience that blesses Christ as contrasted with the nine who only followed the letter of the command.