Contradiction with Matthew 5:16
Galatians 4:15 suggests losing a sense of personal blessing, while Matthew 5:16 encourages letting others see your good works and glorifying God.
Matthew 5:16: Let your light so shine before men, that they may see your good works, and glorify your Father which is in heaven.
Contradiction with 1 Thessalonians 5:16
Galatians 4:15 hints at losing joy, whereas 1 Thessalonians 5:16 instructs believers to rejoice always.
1 Thessalonians 5:16: Rejoice evermore.
Contradiction with James 1:2
Galatians 4:15 implies sorrow over loss, contrary to James 1:2, which advises considering trials as pure joy.
James 1:2: My brethren, count it all joy when ye fall into divers temptations; [temptations: or, trials]
Contradiction with Philippians 4:4
While Galatians 4:15 speaks of a diminishing blessing, Philippians 4:4 repeatedly calls for constant rejoicing in the Lord.
Philippians 4:4: Rejoice in the Lord alway: [and] again I say, Rejoice.