The Bible teaches that thanklessness is a mark of a society in decline, as seen in Romans 1, where a lack of gratitude to God leads to a downward spiral of immorality and other sins. Christians are called to be thankful to God for His good gifts, even in the midst of trials and hardships, and to trust in His sovereignty and authority. This is tested not when things are going well, but when we face difficulties and challenges, and it is during these times that we must submit ourselves to God's will and trust in His goodness.
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