“And Jesus answering said: were there not ten cleansed? But where are the nine?” (Lk 17:17)
Ingratitude is a character trait found in the life of an individual who manifest lack of appreciation/thankfulness for a favour or help done to him. As a believer, we are commanded to thank God for all His manifold blessings on us on daily basis and most importantly for the preciousness of saving our souls from eternal condemnation.
In Psalm 100:4, the Holy Spirit commanded us to ”enter into His gates with thanksgiving, and into His courts with praise: be thankful unto Him, and bless His name”. You’ll discover that this is a command and not an advice. If you praise Him only when you’re told to do so or only when you’re in the company of others, you may not be doing it from the heart, but following a routine. Rather give God spontaneous praise all the time because of His numerous benefits.
Of the ten lepers mentioned in Luke 17:12-17 that Jesus healed miraculously, only one returned to thank Him; the rest carried in them the spirit of entitlement (after all, He is the Saviour of the world, I am entitled to be healed anyway). They are wrong! Because there were so many lepers in Israel then, but at that moment, they were among the fortunate one to meet with His mercies.
The spirit of ingratitude is similar to an act of wicked rebellion against God (Rom 1:21) and it’s listed as one of the end-time evil traits that men will manifest.