Contradiction with Matthew 6:1
This verse warns against performing charitable deeds to be seen by others, which contrasts with openly bearing witness of charity.
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]
Contradiction with Proverbs 21:14
Suggests giving secretly rather than openly, which contradicts the public acknowledgment of charity in 3 John 1:6.
Proverbs 21:14: A gift in secret pacifieth anger: and a reward in the bosom strong wrath.
Contradiction with Matthew 6:4
Encourages giving in secret, that the act may be rewarded by God rather than being witnessed by people, contrasting with seeking endorsement of charity before the church.
Matthew 6:4: That thine alms may be in secret: and thy Father which seeth in secret himself shall reward thee openly.