Contradiction with Proverbs 16:9
This verse states that a man's heart devises his way, but the Lord directs his steps, suggesting human plans can be guided by God, contrasting Psalms 21:11 where human plans are thwarted by God.
Proverbs 16:9: A man's heart deviseth his way: but the LORD directeth his steps.
Contradiction with Isaiah 55:8-9
These verses emphasize that God's thoughts and ways are higher than human's, indicating human plans cannot ultimately succeed against God's will, showing a contrast with the potential success implied in human plotting in Psalms 21:11.
Isaiah 55:8-9: For my thoughts [are] not your thoughts, neither [are] your ways my ways, saith the LORD.
Contradiction with Proverbs 19:21
This verse indicates many are the devices in a man's heart, but the counsel of the Lord will stand, which suggests God's plans prevail over human ones, in contrast to Psalms 21:11 implying plotting by humans.
Proverbs 19:21: [There are] many devices in a man's heart; nevertheless the counsel of the LORD, that shall stand.
Paradox #1
The contradiction or conflict could arise from the theme of wishing or acknowledging harm toward others. This might conflict with teachings of forgiveness or love for enemies found elsewhere in the Bible. It presents a tension between justice and compassion.