"And Jesus answering said, Were there not ten cleansed? but where are the nine?" (Luke 17:17).
Ten lepers, hopeless and incurable, had come to Jesus, begging for His help, and He had miraculously healed them. All ten should have fallen down to worship and thank Him, but only one praised God and thanked Jesus for His marvelous deliverance, while the others rushed away.
We are at first amazed at such ingratitude, until we realize that not more than 10% of even those people who know about Christ ever stop to give Him thanks for His innumerable blessings -- life, freedom, food, shelter, health, family, and especially easy access to the Bible and His gracious offer of salvation -- far greater in value than the gift of special healing received by the ten lepers.
The thankful leper received a much greater gift than all the others. "Thy faith hath made thee whole" (Luke 17:19). They had received an outward cleansing of the body, he an inward cleansing of the soul! These words spoken by Christ are found four other times in the New Testament (Matthew 9:22; Mark 5:34; 10:52; Luke 8:48), plus two other times where the word for "made whole" is translated "saved" (Luke 7:50; 18:42). This word (Greek, sozo) occurs many other times. For example: "He is able also to save them to the uttermost that come unto God by Him" (Hebrews 7:25).
Ten lepers were healed, but only one was saved, and the proof of his salvation, received through genuine faith in Christ, was his gratitude, giving glory to God. The primary evidence of being "filled with the Spirit" (Ephesians 5:18) is that the one so controlled by God's regenerating Spirit will be "Giving thanks always for all things unto God and the Father in the name of our Lord Jesus Christ" (Ephesians 5:20). Those who are not thankful to their saving Lord are the 90% who have not been made whole. HMM