Contradiction with Ecclesiastes 3:4
This verse speaks of a time to weep and a time to mourn, whereas Philippians 4:4 calls to always rejoice.
Ecclesiastes 3:4: A time to weep, and a time to laugh; a time to mourn, and a time to dance;
Contradiction with Lamentations 5:15
It talks about joy ceasing and mourning being constant, contrasting Philippians 4:4's call for continual rejoicing.
Lamentations 5:15: The joy of our heart is ceased; our dance is turned into mourning.
Contradiction with John 16:20
Jesus tells His disciples they will weep and lament while the world rejoices, which opposes the direction to always rejoice in Philippians 4:4.
John 16:20: Verily, verily, I say unto you, That ye shall weep and lament, but the world shall rejoice: and ye shall be sorrowful, but your sorrow shall be turned into joy.
Contradiction with James 4:9
Advises turning laughter to mourning and joy to heaviness, contrary to the encouragement in Philippians 4:4 to rejoice always.
James 4:9: Be afflicted, and mourn, and weep: let your laughter be turned to mourning, and [your] joy to heaviness.
Contradiction with Proverbs 14:13
Mentions that even in laughter the heart may be sorrowful, conflicting with the directive in Philippians 4:4 to be always rejoicing.
Proverbs 14:13: Even in laughter the heart is sorrowful; and the end of that mirth [is] heaviness.