Contradiction with Proverbs 28:13
Contradicts the idea of declaring ways to God by suggesting that hiding one's transgressions will prevent mercy, whereas Psalms 119:26 implies openness brings understanding.
Proverbs 28:13: He that covereth his sins shall not prosper: but whoso confesseth and forsaketh [them] shall have mercy.
Contradiction with Matthew 6:6
Suggests praying in secret rather than openly declaring, as implied by declaring one's ways in Psalms 119:26.
Matthew 6:6: But thou, when thou prayest, enter into thy closet, and when thou hast shut thy door, pray to thy Father which is in secret; and thy Father which seeth in secret shall reward thee openly.
Contradiction with Isaiah 29:15
Reinforces secrecy as those who do works in darkness say "Who seeth us?", contrasting with openly declaring one's ways.
Isaiah 29:15: Woe unto them that seek deep to hide their counsel from the LORD, and their works are in the dark, and they say, Who seeth us? and who knoweth us?