Why must we have grateful heart at all times?

IT IS A TERRIBLE SIN TO BITE THE FINGERS THAT FEED YOU.

Omooba77:
Why must we have grateful heart at all times?

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... because mankind, but for the grace and mercy of GOD, doesn't deserve anything good since the fall in Eden... but GOD IS...good!!! (Matthew 19:17, Mark 10:18, Luke 18:19)

"for all have sinned and fall short of the glory of God," -Romans 3:23

"For the wages of sin is death, but the gift of God is eternal life in Christ Jesus our Lord." - Romans 6:23

"Through the Lord’s mercies we are not consumed, Because His compassions fail not. They are new every morning; Great is Your faithfulness." - Lamentations 3:22-23

The very air we breathe is a gift... among many, many other blessings and mercies... despite evident ingratitude and even futile open rebellion against GOD...

"that you may be sons of your Father in heaven; for He makes His sun rise on the evil and on the good, and sends rain on the just and on the unjust." - Matthew 5:45

"Oh, that men would give thanks to the Lord for His goodness, And for His wonderful works to the children of men!" - Psalm 107:8, 15, 21, & 31