Contradiction with Ecclesiastes 7:3
Proverbs 15:13 suggests that a merry heart brings joy to the countenance, whereas Ecclesiastes 7:3 states that sorrow is better than laughter, which contradicts the idea of joy being inherently better.
Ecclesiastes 7:3: Sorrow [is] better than laughter: for by the sadness of the countenance the heart is made better. [Sorrow: or, Anger]
Contradiction with Proverbs 14:13
Proverbs 15:13 emphasizes a merry heart leading to a cheerful face, while Proverbs 14:13 acknowledges that laughter can hide sorrow, indicating that outward appearances may not reflect inner emotions.
Proverbs 14:13: Even in laughter the heart is sorrowful; and the end of that mirth [is] heaviness.
Contradiction with James 4:9
Proverbs 15:13 associates happiness with a positive demeanor, while James 4:9 urges a shift from laughter to mourning and joy to heaviness, suggesting a contradiction in the expected emotional response.
James 4:9: Be afflicted, and mourn, and weep: let your laughter be turned to mourning, and [your] joy to heaviness.
Contradiction with Isaiah 22:12-13
Proverbs 15:13 focuses on the joy a merry heart brings, whereas Isaiah 22:12-13 highlights a call to mourning and grief amid celebrations, contradicting the association of a merry heart with positive outcomes.
Isaiah 22:12-13: And in that day did the Lord GOD of hosts call to weeping, and to mourning, and to baldness, and to girding with sackcloth: