Contradiction with Proverbs 16:28
A froward man soweth strife: and a whisperer separateth chief friends, which contradicts discouraging gossip and slander.
Proverbs 16:28: A froward man soweth strife: and a whisperer separateth chief friends. [soweth: Heb. sendeth forth]
Contradiction with Ecclesiastes 3:7
A time to rend, and a time to sew; a time to keep silence, and a time to speak, which implies there is a time when speaking (even negatively) might be appropriate.
Ecclesiastes 3:7: A time to rend, and a time to sew; a time to keep silence, and a time to speak;
Contradiction with Proverbs 26:4
Answer not a fool according to his folly, lest thou also be like unto him, suggests moments when harshness in speech might match one's company, seemingly conflicting with the call for blameless speech.
Proverbs 26:4: Answer not a fool according to his folly, lest thou also be like unto him.