Proverbs 16:2 reiterates the same contrast: people see their ways as pure, but God weighs the spirit.

In Proverbs 24:12, the same phrase 'pondereth the heart' appears, emphasizing that God knows and will repay each person according to their deeds.

Proverbs 30:12 describes those 'clean in their own eyes' despite inner filth, a direct parallel to 'right in his own eyes'.

Proverbs 16:25 warns that self-justified paths lead to death, adding consequences to the self-deception in 21:2.

Proverbs 20:6 contrasts outward boasts of loyalty with true faithfulness, similar to 21:2's contrast of self-opinion vs. God's judgment.

In Revelation 2:23, Christ says he searches minds and hearts and repays according to works — a clear NT echo of God pondering hearts in Proverbs 21:2.

Galatians 6:3 warns against thinking oneself something when nothing, directly relating to the self-deception in Proverbs 21:2.

In John 2:25, Jesus knew what was in man — a direct NT example of God pondering the heart, matching the theme of Proverbs 21:2.

In Luke 18:11, the Pharisee's prayer exemplifies the self-righteousness of one 'right in his own eyes' from Proverbs 21:2.

In Luke 16:15, Jesus says people justify themselves but God knows hearts — a direct NT parallel to humans thinking their way is right while God discerns motives.

In Jeremiah 17:10, God declares he searches the heart and tries the mind to reward each person — echoing the divine heart-knowledge of Proverbs 21:2.

Psalm 36:2 depicts self-flattery that hides sin, mirroring the self-deception in Proverbs 21:2 about one's own way being right.

In 1 Samuel 16:7, God tells Samuel he looks at the heart, not outward appearance — directly reinforcing that God weighs motives unlike human self-perception.

In 1 Chronicles 29:17, David affirms that God tries the heart and delights in uprightness — reinforcing that God examines inner motives, not just actions.

In 1 Corinthians 4:4, Paul says even a clear conscience doesn't acquit — only the Lord judges, directly echoing that God weighs hearts beyond self-assessment.

In 2 Corinthians 10:18, Paul contrasts self-commendation with the Lord's approval — exactly the idea that human ways seem right but God judges truly.

In Deuteronomy 12:8, Israel is warned not to do 'what is right in his own eyes' — the very phrase that Proverbs 21:2 describes as human self-deception.