Contradiction with Proverbs 30:6
This verse warns against adding to God's words, suggesting that one should not stretch the truth, which contrasts with always having an answer of God's truth as desired in Psalm 119:43.
Proverbs 30:6: Add thou not unto his words, lest he reprove thee, and thou be found a liar.
Contradiction with Ecclesiastes 5:2
Advises to be cautious with words and not to speak hastily, which can be seen as contradicting the promptness to speak God's word as in Psalm 119:43.
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 7:6
Suggests not to give what is holy to those who will not appreciate it, which might contrast with speaking God's word openly as requested in Psalm 119:43.
Matthew 7:6: Give not that which is holy unto the dogs, neither cast ye your pearls before swine, lest they trample them under their feet, and turn again and rend you.