Contradiction with Philippians 4:4
While Lamentations 2:18 talks about mourning, Philippians 4:4 encourages rejoicing.
Philippians 4:4: Rejoice in the Lord alway: [and] again I say, Rejoice.
Contradiction with 1 Thessalonians 5:16
This verse calls believers to rejoice always, contrasting with the mourning in Lamentations 2:18.
1 Thessalonians 5:16: Rejoice evermore.
Contradiction with James 5:13
Instructs those who are cheerful to sing psalms, opposing the weeping and mourning in Lamentations 2:18.
James 5:13: Is any among you afflicted? let him pray. Is any merry? let him sing psalms.
Contradiction with Psalm 30:5
Speaks of joy coming in the morning, which contrasts with the ongoing mourning in Lamentations 2:18.
Psalm 30:5: For his anger [endureth but] a moment; in his favour [is] life: weeping may endure for a night, but joy [cometh] in the morning. [his anger...: Heb. there is but a moment in his anger] [for a night: Heb. in the evening] [joy: Heb. singing]
Contradiction with Isaiah 61:3
Talks about giving beauty for ashes and joy for mourning, contrasting the lamenting in Lamentations 2:18.
Isaiah 61:3: To appoint unto them that mourn in Zion, to give unto them beauty for ashes, the oil of joy for mourning, the garment of praise for the spirit of heaviness; that they might be called trees of righteousness, the planting of the LORD, that he might be glorified.