Contradiction with Proverbs 27:2
While Isaiah 12:4 encourages proclaiming God's deeds, Proverbs 27:2 advises letting others praise you instead of boasting about oneself.
Proverbs 27:2: Let another man praise thee, and not thine own mouth; a stranger, and not thine own lips.
Contradiction with Ecclesiastes 5:2
Isaiah 12:4 urges speaking of God's works, but Ecclesiastes 5:2 advises caution in speaking, suggesting fewer words before God.
Ecclesiastes 5:2: Be not rash with thy mouth, and let not thine heart be hasty to utter [any] thing before God: for God [is] in heaven, and thou upon earth: therefore let thy words be few. [thing: or, word]
Contradiction with Matthew 6:1
Isaiah 12:4 encourages making God's deeds known, but Matthew 6:1 warns against performing acts for the attention of others.
Matthew 6:1: Take heed that ye do not your alms before men, to be seen of them: otherwise ye have no reward of your Father which is in heaven. [alms: or, righteousness] [of your: or, with your]