True saving Faith is by God's Sovereign Grace and from His mercy alone

True saving Faith is by God's Sovereign Grace and knowing it is of His mercy alone. Luke 17-16 -And fell down on His face at his feet, giving Him thanks- and he was a Samaritan. 17 And Jesus answering said, Were there not ten cleansed-- but where are the nine-- 18 There are not found that returned to give glory to God, save this stranger-