Contradiction with Matthew 5:16
Encourages letting your light shine before others to glorify God, which contrasts with Matthew 6:4's emphasis on giving in secret.
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 Luke 8:17
States that nothing hidden will remain secret, which contradicts the idea of keeping charitable acts hidden.
Luke 8:17: For nothing is secret, that shall not be made manifest; neither [any thing] hid, that shall not be known and come abroad.
Contradiction with Matthew 23:5
Criticizes those who do deeds to be seen by others, yet Matthew 6:4 suggests secrecy; the critique implies visibility might still occur.
Matthew 23:5: But all their works they do for to be seen of men: they make broad their phylacteries, and enlarge the borders of their garments, [phylacteries: pieces of parchment containing sentences of the law]
Contradiction with 1 Peter 2:12
Urges good conduct among non-believers to lead them to glorify God, thus suggesting observable acts, contrary to the secretive approach in Matthew 6:4.
1 Peter 2:12: Having your conversation honest among the Gentiles: that, whereas they speak against you as evildoers, they may by [your] good works, which they shall behold, glorify God in the day of visitation. [whereas: or, wherein]